feat: Implement SKIP_OLLAMA feature for optional setup without Ollama installation and add documentation

refactor: Enhance .profile for Go path management and environment variable setup

dotfiles/.profile

@@ -49,8 +49,12 @@ if [ -d "$HOME/go/bin" ] ; then
 fi
 
 # Add Go version-specific paths if they exist
+shopt -s nullglob 2>/dev/null || setopt nullglob 2>/dev/null || true
 for go_path in /usr/lib/go-*/bin /usr/lib/go/bin; do
     if [ -d "$go_path" ] ; then
         PATH="$go_path:$PATH"
     fi
 done
+shopt -u nullglob 2>/dev/null || unsetopt nullglob 2>/dev/null || true
+
+export GOROOT=/usr/local/go