jappuccini · SteffenLm · Jul 25, 2026 · Jul 25, 2026 · Jul 25, 2026
diff --git a/UPDATE_CHECKLIST.md b/UPDATE_CHECKLIST.md
@@ -0,0 +1,12 @@
+# Dependency Update Checklist
+
+- [ ] Run `npm ci` and verify dependencies install without additional flags or
+      manual changes.
+- [ ] Run `npm run build` and verify the production site builds successfully.
+- [ ] Run `npm run start` and verify the docs are visible at
+      http://localhost:3000.
+- [ ] With the local site running, verify Mermaid diagrams render correctly.
+- [ ] With the local site running, verify slides open correctly.
+- [ ] When updating Docusaurus, check whether its `@mermaid-js/layout-elk` peer
+      dependency supports 0.2.x or later; if so, remove the corresponding
+      Dependabot ignore rule in `.github/dependabot.yml`.
diff --git a/docs/additional-material/steffen/java-1/slides.md b/docs/additional-material/steffen/java-1/slides.md
@@ -5,27 +5,41 @@ sidebar_position: 10
 tags: []
 ---
 
-- 08.01.2026 [Einleitung](/slides/steffen/java-1/intro)
 - 08.01.2026
-  [Datentypen und Datenobjekte ](/slides/steffen/java-1/datatypes-and-dataobjects)
+  <a href="/slides/steffen/java-1/intro" target="_blank" rel="noopener noreferrer">Einleitung</a>
+- 08.01.2026
+  <a href="/slides/steffen/java-1/datatypes-and-dataobjects" target="_blank" rel="noopener noreferrer">Datentypen
+  und Datenobjekte</a>
 - 09.01.2026
-  [Methoden und Operatoren](/slides/steffen/java-1/methods-and-operators)
+  <a href="/slides/steffen/java-1/methods-and-operators" target="_blank" rel="noopener noreferrer">Methoden
+  und Operatoren</a>
 - 15.01.2026
-  [Kontrollstrukturen und Arrays](/slides/steffen/java-1/if-and-switch)
+  <a href="/slides/steffen/java-1/if-and-switch" target="_blank" rel="noopener noreferrer">Kontrollstrukturen
+  und Arrays</a>
 - 16.01.2026
-  [Math, Random und Scanner](/slides/steffen/java-1/math-random-scanner)
+  <a href="/slides/steffen/java-1/math-random-scanner" target="_blank" rel="noopener noreferrer">Math,
+  Random und Scanner</a>
 - 22.01.2026 Kurztest
-- 22.01.2026 [Klassen und Objekte](/slides/steffen/java-1/classes-and-objects)
+- 22.01.2026
+  <a href="/slides/steffen/java-1/classes-and-objects" target="_blank" rel="noopener noreferrer">Klassen
+  und Objekte</a>
 - 23.01.2026
-  [Konstruktor und static](/slides/steffen/java-1/constructor-and-static)
+  <a href="/slides/steffen/java-1/constructor-and-static" target="_blank" rel="noopener noreferrer">Konstruktor
+  und static</a>
 - 05.02. & 06.02.2026
-  [Java API, Enum, Klassendiagramm, Aktivitätsdiagramm](/slides/steffen/java-1/class-diagram-java-api-enum)
-- 12.02.2026 [Vererbung](/slides/steffen/java-1/inheritance)
-- 12.02.2026 [Polymorphie](/slides/steffen/java-1/polymorphism)
+  <a href="/slides/steffen/java-1/class-diagram-java-api-enum" target="_blank" rel="noopener noreferrer">Java
+  API, Enum, Klassendiagramm, Aktivitätsdiagramm</a>
+- 12.02.2026
+  <a href="/slides/steffen/java-1/inheritance" target="_blank" rel="noopener noreferrer">Vererbung</a>
+- 12.02.2026
+  <a href="/slides/steffen/java-1/polymorphism" target="_blank" rel="noopener noreferrer">Polymorphie</a>
 - 13.02.2026
-  [Abstrakte und finale Klassen](/slides/steffen/java-1/abstract-and-final)
-- 19.02.2026 [Interfaces](/slides/steffen/java-1/interfaces)
-- 20.02.2026 [Exceptions](/slides/steffen/java-1/exceptions)
+  <a href="/slides/steffen/java-1/abstract-and-final" target="_blank" rel="noopener noreferrer">Abstrakte
+  und finale Klassen</a>
+- 19.02.2026
+  <a href="/slides/steffen/java-1/interfaces" target="_blank" rel="noopener noreferrer">Interfaces</a>
+- 20.02.2026
+  <a href="/slides/steffen/java-1/exceptions" target="_blank" rel="noopener noreferrer">Exceptions</a>
 - 27.02.2026 & 06.03.2026 Klausurvorbereitung
 - 10.03.2026 Klausur
 

diff --git a/docs/additional-material/steffen/java-2/slides.mdx b/docs/additional-material/steffen/java-2/slides.mdx
@@ -5,20 +5,93 @@ sidebar_position: 10
 tags: []
 ---
 
-- 09.04.2026 [Wiederholung, Organisatorisches](/slides/steffen/java-2/00-recap)
 - 09.04.2026
-  [Generics und Optional](/slides/steffen/java-2/07-generics-optional)
+  <a
+    href="/slides/steffen/java-2/00-recap"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Wiederholung, Organisatorisches
+  </a>
+- 09.04.2026
+  <a
+    href="/slides/steffen/java-2/07-generics-optional"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Generics und Optional
+  </a>
 - 10.04.2026
-  [Set, Map, Hashes & Records](/slides/steffen/java-2/08-sets-maps-hashes-records)
+  <a
+    href="/slides/steffen/java-2/08-sets-maps-hashes-records"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Set, Map, Hashes & Records
+  </a>
 - 16.04.2026
-  [Funktionale Programmierung](/slides/steffen/java-2/09-functional-programming)
-- 17.04.2026 [Stream Api ](/slides/steffen/java-2/10-stream-api)
+  <a
+    href="/slides/steffen/java-2/09-functional-programming"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Funktionale Programmierung
+  </a>
+- 17.04.2026
+  <a
+    href="/slides/steffen/java-2/10-stream-api"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Stream Api
+  </a>
+- 23.04.2026
+  <a
+    href="/slides/steffen/java-2/01-intro-dsa"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Intro Algorithmen und Daten Strukturen
+  </a>
 - 23.04.2026
-  [Intro Algorithmen und Daten Strukturen](/slides/steffen/java-2/01-intro-dsa)
-- 23.04.2026 [Suchalgorithmen](/slides/steffen/java-2/02-search-algo)
-- 24.04.2026 [Rekursion](/slides/steffen/java-2/03-iteration-recursion)
-- 24.04.2026 [Sortieralgorithmen](/slides/steffen/java-2/04-sort-algo)
-- 11.05.2026 [Stack, Queue, List](/slides/steffen/java-2/05-stack-queue-list)
-- 21.05.2026 [Trees](/slides/steffen/java-2/06-trees)
+  <a
+    href="/slides/steffen/java-2/02-search-algo"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Suchalgorithmen
+  </a>
+- 24.04.2026
+  <a
+    href="/slides/steffen/java-2/03-iteration-recursion"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Rekursion
+  </a>
+- 24.04.2026
+  <a
+    href="/slides/steffen/java-2/04-sort-algo"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Sortieralgorithmen
+  </a>
+- 11.05.2026
+  <a
+    href="/slides/steffen/java-2/05-stack-queue-list"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Stack, Queue, List
+  </a>
+- 21.05.2026
+  <a
+    href="/slides/steffen/java-2/06-trees"
+    target="_blank"
+    rel="noopener noreferrer"
+  >
+    Trees
+  </a>
 - 22.05.2026 Klausurvorbereitung
 - 28.05.2026 Klausur Fortgeschrittene Programmierung (50 Punkte / 60 Minuten)
diff --git a/src/components/Slides/index.tsx b/src/components/Slides/index.tsx
@@ -1,5 +1,6 @@
 import BrowserOnly from '@docusaurus/BrowserOnly';
 import React, { type ReactNode, useEffect } from 'react';
+import type { RevealApi } from 'reveal.js';
 
 interface SlidesProps {
   children: ReactNode;
@@ -13,9 +14,19 @@ function SlidesInner({
   height,
 }: SlidesProps): React.JSX.Element {
   useEffect(() => {
+    let disposed = false;
+    let deck: RevealApi | undefined;
+
     import('./initSlides').then(({ defaultInitSlides }) => {
-      defaultInitSlides();
+      if (!disposed) {
+        deck = defaultInitSlides();
+      }
     });
+
+    return () => {
+      disposed = true;
+      deck?.destroy();
+    };
   }, []);
 
   return (

diff --git a/src/components/Slides/initSlides.ts b/src/components/Slides/initSlides.ts
@@ -1,11 +1,12 @@
 import Reveal from 'reveal.js';
-import Zoom from 'reveal.js/plugin/zoom';
 import Notes from 'reveal.js/plugin/notes';
 import Search from 'reveal.js/plugin/search';
 import Highlight from 'reveal.js/plugin/highlight';
 
 export const defaultInitSlides = () => {
-  new Reveal({
-    plugins: [Zoom, Notes, Search, Highlight],
-  }).initialize({ hash: true });
+  const deck = new Reveal({
+    plugins: [Notes, Search, Highlight],
+  });
+  deck.initialize({ hash: true });
+  return deck;
 };