[nicolasbisurgi]

Adds the Matomo (site ID 11, shared with code.cubewise.com and OptimusPy, split by page path) and Lead Forensics trackers to the landing page and the docs.

Changes

• Landing page (site/homepage/index.html): both snippets, unchanged, at the end of <head>. The app has no client-side router, so the stock page view on load covers it.
• Docs (overrides/main.html, mkdocs.yml): a Material theme override. navigation.instant swaps pages without a reload, so the stock snippet would record only the first page of each visit. The loader in extrahead only configures the tracker. The page view is pushed from Material's document$, which fires on the first load and on every instant navigation, with the referrer, URL and title set each time.
• CI (deploy-site.yml): overrides/** added to the push and pull_request paths, so a change to the override alone still redeploys.

Verification

• npm run build: dist/index.html contains both tracker URLs.
• mkdocs build: trackers on all 18 pages, and the document$ subscription comes after Material's bundle.
• Headless Chrome on a copy with stubbed trackers (no real hits sent): docs home, then three in-site clicks, gave exactly one page view per page and one full document load in total.

Not in this PR

Neither tracker asks for cookie consent, and the site has no consent banner. That's being followed up separately.

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