remove stale docs (#1113)
These are 2022-era docs written by @whyrusleeping
The feed notes stuff is out of date and uncontroversial to remove.
The JWT notes have info that is somewhat intentionally not documented
elsewhere: PDS implementations can put whatever they want in there. I
think self-hosted instances already maybe just use a UUID? But there
might be some cases/hacks where this is helpful. We could copy to
internal docs? I'd still push to remove, don't want lots of folks
building on this and it results in breakage or interop problems down the
line.
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