docs: integrate frame.js debugger

[depatchedmode]

todo:

• [x] update docs to link to frame debugger: https://debugger.framesjs.org/debug
• [x] run frames.js starter repo locally alongside simplest-frame and see if local debugging works

https://framesjs.org/

[depatchedmode]

Works locally! All you have to do is:

1. Clone down the framejs-starter repo
2. yarn install then yarn dev
3. Start your simplest-frame repo with netlify dev (or npm/yarn dev)
4. Go to `http://localhost:3000/debug?http://localhost:3000/debug?url=http://localhost:8888/

[jetlej]

@depatchedmode FYI looks like the URL in your last response here has an extra URL in it