make docs app serve http dynamically

[dr-frmr]

Problem

Docs app was making a ton of static bindings, leading to startup-cruft and excess memory usage (not truly an issue, but this way is cleaner)

Solution

Dynamically serve docs as HTTP requests occur

Testing

Use the app!

Docs Update

N/A

Notes

N/A

[nick1udwig]

LGTM, thanks for the change.

One thing this makes me wonder about is whether we can make use of lazy load/inheritance with these different fancy methods for FS, etc. Its tricky because we can't assume what user is going to do after the method call.

Maybe it is fine: as of now, default is not 100% performant but is ergonomic; if you want 100% performance, you have to write it yourself using inheritance.

OTOH it would be v nice if we could somehow "do it for" people. I expect it'd be tricky tho.