Quote table name in `OpSetReplicaIdentity` (xataio#206)

Fix table name quoting in the `OpSetReplicaIdentity` operation. 

This was causing the operation to fail on tables with case-sensitive
names.

Add section to README about RLS in Postgres 14 (xataio#202)

Add a section covering the limitations of `pgroll` and row level
security policies in Postgres 14.

[[Direct
link](https://github.com/xataio/pgroll/blob/document-rls/docs/README.md#supported-postgres-versions)]

Relates to xataio#179

Remove unnecessary env section from release job (xataio#188)

goreleaser's template already populates a .Version field so we don't
need this (it was unused since the switch to goreleaser).

Disable CGO (xataio#176)

CGO is not required by pgroll, disable it so builds are more compatible

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Co-authored-by: Andrew Farries <[email protected]>

Add missing concepts to the docs (xataio#157)

This was the last missing peace to complete docs, hence I removed the
"in progress" warning. Of course, we will keep improving them and
addressing feedback, but I believe we can consider them complete.

Do some small improvements to the schemas diagram (xataio#125)

Be more consistent about "active migration period", reflect the right
color on age line