…berg, Pinot pages

Typed projections (PR #29) work on every SQL connector; surface it in the
feature table of the narrower-verified connector pages too.

…R BY alias

Catch the memgql docs up to PRs #24, #29, #30:
- changelog: new v0.7.0 section (typed RETURN p / RETURN r, connection-less
  RETURN 1 liveness, ORDER BY by RETURN alias, delimited identifiers, Postgres
  NUMERIC fix)
- reference: add whole-node/whole-relationship + liveness matrix rows; drop the
  now-false 'RETURN n returns column values' limitation
- connect/{postgres,mysql,duckdb}: add whole-node/whole-relationship matrix row;
  drop the stale RETURN n limitation

…berg, Pinot pages

Typed projections (PR #29) work on every SQL connector; surface it in the
feature table of the narrower-verified connector pages too.