merge: merge back stable into default

Added tag v4.0.1 for changeset 170c5398320e

merge: merged default into stable

docs: added 4.0.1 release notes

configs: updated default config. - default for Beaker suddenly is memory, and we shoould make file a default.

makefile: added commands to quickly build docs.

authn: don't use formatted_json to log statements. It totally screws up logging formatting, and makes big entries in logs with newlines.

configs: show worker_connection option for gunicorn

logging: fixed log formatting

dependencies: Add gunicorn Adding gunicorn into the default environment so that we have it available when dunning nix-shell as well.