Attempt a pipx uninstall if pipx is available

So we can remove ramalama via various install techniques

Signed-off-by: Eric Curtin <[email protected]>

hack/rm.sh

@@ -1,12 +1,20 @@
 #!/bin/bash
 
+available() {
+  command -v "$1" >/dev/null
+}
+
 main() {
   set -e -o pipefail
   local rootdirs=("/opt/homebrew" "/usr/local" "/usr" "")
   local rootdir
   for rootdir in "${rootdirs[@]}"; do
     rm -rf "$rootdir/bin/ramalama" "$rootdir/share/ramalama"
   done
+
+  if available pipx; then
+    pipx uninstall ramalama
+  fi
 }
 
 main "$@"