Constellation, Spacedust, Slingshot, UFOs: atproto crates and services for microcosm

oops ulimit (again)

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constellation/readme.md
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- [x] backups!
- [x] manual backup on startup
- [x] background task to create backups on an interval
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- [ ] add a low-ulimit check on startup?
cache
- [ ] set api response headers
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cozy-setup (move to another repo).md
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etc
- follow above `- raspi node_exporter`
- configure victoriametrics to scrape the new pi
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- configure ulimit before starting! `ulimit -n 16384`
- `RUST_BACKTRACE=full cargo run --release -- --backend rocks --data /mnt/constellation-index/ --jetstream us-east-2 --backup /home/pi/backup/constellation-index --backup-interval 6 --max-old-backups 20`
- add server to nginx gateway upstream: ` server 100.123.79.12:6789; # bootes`
- stop backups from running on the older instance! `RUST_BACKTRACE=full cargo run --release -- --backend rocks --data /mnt/links-2.rocks/ --jetstream us-east-1`
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- stop upstreaming requests to older instance in nginx
- todo: overlayfs? would need to figure out builds/updates still, also i guess logs are currently written to sd? (oof)