docs: remove reference to defunct anigma channel



https://git.sr.ht/~gheartsfield/nostr-rs-relay/commit/d71f5cb0293df65f1a1f3ee97fb2b68d95a0d0a8 

 improvement: describe migration step that failed



https://git.sr.ht/~gheartsfield/nostr-rs-relay/commit/c5fb16cd9814fa8f46850da123f2b30093ebb26d 

 improvement: disable limit_scrapers by default

This is a good feature, but will limit valid requests from beingserved.  Defaulting this to off will be less surprising to relay ops.

https://git.sr.ht/~gheartsfield/nostr-rs-relay/commit/971889f9a6f069aadf2003a7fa9092e25effb290 

 docs: ensure latest Rust base image is pulled



https://git.sr.ht/~gheartsfield/nostr-rs-relay/commit/1ce029860cfbdda2b80b777d6222241c78c5d0b1