Organize and commit nvim configuration improvements

**Configuration Enhancements:**
- Enable Nerd Font support in init.lua
- Enhanced LSP configuration with better clangd setup
- Improved query driver paths and error handling
- Added support for more filetypes (cmake, tex, etc.)

**Plugin Management:**
- Add GitHub Copilot integration
- Remove experimental plugins (avante, completion, statusline, theme)
- Reorganize plugin imports for better structure

**Repository Maintenance:**
- Update .gitignore for better artifact handling
- Clean up unused plugin configurations
- Establish clean baseline for future development

Resolves #12

.gitignore

@@ -1,14 +1,24 @@
-tags
-test.sh
-.luarc.json
-nvim
+# OS files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
 
-spell/
-
-# Project status tracking (local only)
-CLAUDE.md
-STATUS.md
-VIDINTEL.md
-KEYBIND_ANALYSIS.md
+# Neovim runtime files
+.cache/
+.local/
+*.tmp
+*.swp
+*.swo
+*~
 
+# Plugin artifacts
 lazy-lock.json
+.luarc.json
+
+# Development artifacts
+*.disabled
+todo.md