It focuses on the wrong goal.

From:

> a way to discover applications that can handle unknown event-kinds.

To:

> ways to register Nostr applications and their support for given event kinds as well as allow users to recommend applications to others.

I would write as:

1. Here's how to register an app

2. Here is how a user registers a recommendation

3. Here is how to use recommendations to discover applications from followers

4. Here is how Handlers work

5. Here are the list of all possible environments that handlers can be registered with.

Get rid of the 31337 example. Simplify filters (no need to do the whole [REQ...