feat: Sync complete config - Fish, Ghostty, Neovim Scratch

- Add missing Fish configs (direnv, ssh function)
- Add Tokyo Night theme for Ghostty
- Complete Neovim scratch config sync
- Rewrite install.sh for new structure
- Add comprehensive README.md

.config/fish/conf.d/direnv.fish

@@ -0,0 +1,8 @@
+# Direnv integration for fish
+if type -q direnv
+    # Remove any existing direnv functions first
+    functions -e __direnv_export_eval 2>/dev/null
+    
+    # Set up direnv with the correct path
+    eval (direnv hook fish)
+end