feat(mcp): restore setup docs with public operations (#4748)

## Summary

restore's @sanjanaladdha's new mcp docs page, but uses the new public
api/cli/tools list operation so we don't have to do an actual authed mcp
operation to get that, which was causing us issues.

requires monorepo pr
[here](https://github.com/inngest/monorepo/pull/8225)