- Rename pylink-opers.md -> relay-quickstart.md to better reflect its contents.
- Add a section regarding services compatibility and which features _not_ to use with Relay
- Document LINKACL whitelists, CHANDESC, CLAIM/LINKACL options introduced in 2.0
- Document reworked KILL handling in 2.0 and why K/G/ZLINE support hasn't been implemented
- Explain Relay concepts in more depth for people not familiar with Janus
