Track REST API documentation

[JerryHue]

Issue #203 was created over a year ago, as an attempt to document the REST API that Telescope has. Since that issue has gone stale and does not have much context, I would like to revamp that issue into an issue that tracks all the documentation we need to write for the 3.0 release.

• Write feed-discovery documentation #3146
• Add docs for dependency-discovery #3542
• Write image service documentation #3460
• Change legacy backend related + parser docs #3419
• Write posts service documentation #3293
• Update Search readme #3524
• SSO service documentation #3523
• Status service documentation #3543

Add items to the list that you find to be necessary.

If you want to start the documentation for a specific service, hover over the item and click on the issue icon found to the right to open another issue that tracks the progress for that specific item.

[DukeManh]

Are we agreed on using https://blog.logrocket.com/documenting-your-express-api-with-swagger/

[JerryHue]

@DukeManh, I think we can open a future issue that researches more about this. There would be a few services (the dependency-discovery comes to mind) that will have their API changed, so having an documentation tool that makes this easier would be helpful.

The idea is that the tool is, at the very least, compatible with Docusaurus, and that we can somehow install it in a monorepo?