* Add Archivr brand identity and favicon
- Brand style guide (docs/branding/style-guide.html): logo, clear
space, don'ts, color palette, typography, in-context mockup
- Logo assets (docs/branding/assets/): lockup SVGs for dark/light
backgrounds, standalone mark, favicon.svg, multi-size favicon.ico
- Wire favicon into frontend/index.html (SVG + ICO fallback);
frontend/public/ seeded so Vite copies assets on next build
- Revert display strings archivr back to Archivr in UI
(Topbar, LoginPage, SetupPage, index.html titles, flake.nix)
- Update .gitignore to allow docs/branding/
* Build frontend with favicon links and assets
* Fix static file serving: serve all of static/ with SPA index.html fallback
Previously only /assets/* was served from disk; all other paths
(including /favicon.ico, /favicon.svg) hit the index.html fallback.
Replace nest_service("/assets") + fallback_service(index.html) with
ServeDir on the full static dir and not_found_service(index.html),
so any file that exists in static/ is served directly.
