cleanup: Formatting changes as well as removal of unused modules
Notable changes include:
- remove references to fly-agaric and dandelion hosts
- remove syncthing module
- remove binary-cache module
- remove unused development modules
- remove eturnal module
- remove kde module
- remove nfs module
- remove sss modules
- remove dendrite module
- remove dufs module
- remove ejabberd module
- remove libvirt module
- remove redundant smartd configuration from lily
- remove remove packages module from lily and lutea
- move flake management utilities into nix module
- remove unused patches and packages
- adjust domains we get certs for using cp-certs
- remove netbird firewall rule