feat: add Go to source links on reference pages

[sharadvc]

Summary

Add an “edit this page on GitHub” footer on reference pages that links to the locale-specific JSON under content/references/translations/ on main.

Fixes #704

[netlify]

✅ Deploy Preview for java-processing-faf822 ready!

Name	Link
🔨 Latest commit	b4b1d9f
🔍 Latest deploy log	https://app.netlify.com/projects/java-processing-faf822/deploys/6aa65f47c973a90008ee5b9a
😎 Deploy Preview	https://deploy-preview-712--java-processing-faf822.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
🤖 Make changes	Run an agent on this branch

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[SableRaf]

Hi, and thanks for your interest in contributing. Please take a moment to review our contribution guidelines. We ask contributors to discuss an issue, get assigned, and only then start working on a PR. We also generally only assign one issue at a time, especially for first time contributors.

In this case, the reference .json files are generated from Javadoc in the Processing source code and should generally not be edited directly. Pointing an “edit this page on GitHub” link directly to those generated files does not fix the underlying issue. This is documented in our reference content guide, and was also correctly identified by @ulgens in the issue you referenced.

Note: you’ve opened several PRs in quick succession for issues you were not assigned to. Please don’t open further PRs until the proposed approach has been discussed and a maintainer has assigned the issue to you. Thank you.