TODO: Break README into multiple docs

[cyrusae]

Low-priority but might be nice: break out the README so that the skeleton "what is this, how do you use it, and why" is more focused with more details in subsidiary files.

TODO: Which details get broken out?

• the more detailed "what command to use where" ones?
• examples section -> "see examples/README.md"?
• philosophy section?

The problem with the README containing everything I want it to is now I feel like it might be too beefy... but it literally has all the contents I wanted...

[cyrusae]

Maybe "See examples/README.md" with the examples README covering:

• Intro to the examples (what's currently in main README)
• Usage suggestions
• Backlink to the context prompt

Introduce the examples with what their context prompt would've been?

And break out "Contributing & philosophy" for "dig further into the dev concerns" so it's immediately accessible but not a distraction from people wanting to just use the sandwich?