a cache for slack profile pictures and emojis

docs: add missing install steps

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README.md
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```bash
cp cachet.service ~/.config/systemd/user/
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mkdir data
systemctl --user enable cachet
systemctl --user start cachet
```
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Now grab a free port from nest (`nest get_port`) and then link your domain to your nest user (`nest caddy add cachet.dunkirk.sh`) (don't for get to make a CNAME on the domain pointing to `kierank.hackclub.app`) and then after editing in a `Caddyfile` entry like the following you should be good to go!
+
Now grab a free port from nest (`nest get_port`) and then link your domain to your nest user (`nest caddy add cachet.dunkirk.sh`) (don't for get to make a CNAME on the domain pointing to `kierank.hackclub.app`) and then after editing in a `Caddyfile` entry like the following you should be good to go! (Don't forget to restart caddy: `systemctl restart --user caddy`)
```caddy
http://cachet.dunkirk.sh {