* website: fix broken GitHub links for project files in docs
* website: fix broken links across docs and pages
Render glossary tooltips through the shared replaceLink transform so
their relative links become absolute site URLs instead of 404ing when
injected across pages; add the English-only routes (downloads, faq,
jobs, reproduce, security, transparency) to supportedRoutes so the
language switcher stops emitting href="undefined"; passthrough-copy
docs/guide/images, docs/guide/diagrams and docs/themes.
Fix the SIMPLEX.md p2p anchor typo and correct image paths in CLI,
the v0.4 blog post and the fr/pl translation docs to point at the
existing shared assets.
