docs: update changelog, site, and plugin versions for v1.12.0

docs: update changelog and bump versions for v1.11.1

docs: update changelog and bump versions for v1.11.0

docs: update changelog and site for v1.10.0

docs: update changelog for v1.9.1

docs: update changelog, site, and plugin versions for v1.9.0

docs: update changelog, site, and plugin versions for v1.8.1

docs: update changelog, site, and plugin versions for v1.8.0

docs: update changelog, site, and plugin versions for v1.7.1

docs: update changelog, site, and plugin versions for v1.7.0

revdiff plugin 0.8.14 -> 0.8.15 (herdr + agent-deck launcher backends),
revdiff-planning plugin 0.3.5 -> 0.3.6 (herdr backend in plan-review launcher).