Remove tracked files that should be in .gitignore

- Stop tracking .claude/settings.local.json (local settings)
- Stop tracking site/cache/index.html (cache file)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -1,13 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Bash(git add:*)",
-      "Bash(git commit:*)",
-      "Bash(cat:*)",
-      "WebFetch(domain:unicode-org.github.io)",
-      "Bash(git mv:*)"
-    ],
-    "deny": [],
-    "ask": []
-  }
-}