feat(configs): allow json log format for gunicorn

docs: back to main page link, link to rcstack docs higher, small fixes

docs: added another link to rcstack dev setup

chore: fixed minor issues with quickstart page

docs: removed mentions of Nix manager, replaced some occurences of legacy rccontrol mentions, reworked quickstart

chore(caches): cleanup cache lib and added cleanup backend

feat(configs): deprecared old hooks protocol and ssh wrapper. New defaults are now set on v2 keys, so previous installation are automatically set to new keys. Fallback mode is still available.

feat(config): deprecated old ssh wrapper command and make the v2 the default one

Moved K8s docs to the helm chart repository

- Added Kubernetes deployment section to the documentation - Small formating fixes to the documentation