fix: SPA fallback routing for standard.site deep links
add _redirects with SPA rewrite so Wisp serves index.html for all
paths. app.js converts pathname to hash route on load, making URLs
like /roadmap and /devlog/001 work when linked from search indexes.
also add glibc to nixery deps so patchelf can actually find the
dynamic linker for wisp-cli.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>