Docs suggest using npx plugins, but I don't think that's maintained anymore

Improve documentation

Link

https://supabase.com/docs/guides/ai-tools/plugins

Describe the problem

This page says to use npx plugins for installation. However, that package's npm listing links to https://github.com/vercel-labs/plugins, which is a 404, so there's nowhere to look at the source code or file issues or anything. Vercel's support bot says this functionality moved into the skills CLI and people should use that instead.

Describe the improvement

Presumably point people to skills instead of plugins? Unfortunately I'm not sure if you can just run npx skills add supabase-community/supabase-plugin, or what.