Add raster-react pixel icons and GitHub repo metadata

Replaced text icons in feature grid with pixel-art raster-react
components (SearchIcon, NetworkIcon, FolderIcon, etc.). Added
GithubIcon and LinkedinIcon to nav and author section.
SpaceInvadersIcon in nav branding. Set repo homepage to claudm.com
with topics: claude-code, tui, terminal, bun, launcher, cli.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

site/package.json

@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "next": "16.1.6",
+    "raster-react": "^0.2.0",
     "react": "19.2.3",
     "react-dom": "19.2.3"
   },