feat(site): new home page, docs, and design system (#566)

Co-authored-by: Darius Cepulis <dcepulis@mux.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

.vscode/extensions.json

@@ -4,6 +4,7 @@
     "hyrious.import-cost",
     "streetsidesoftware.code-spell-checker",
     "DavidAnson.vscode-markdownlint",
+    "esbenp.prettier-vscode",
     "astro-build.astro-vscode",
     "unifiedjs.vscode-mdx"
   ]