Remove DocC documentation from public repo

Documentation now hosted privately at swiftdatatables.pavankataria.com.
Source files remain local but are no longer tracked in git.

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

Author: pavankataria

.gitignore

@@ -47,5 +47,6 @@ Example/Local.xcconfig
 .vscode/
 INSTRUCTIONS.md
 
-# Website docs export (private repo)
+# Documentation (private website)
 docs/
+*.docc/