When this subordinate is removed from a unit it leaves its configuration
files behind. This can become an issue if the subordinate is added back
to the unit as pointed out in #2004088.
This change adds a cleanup step to the `stop` hook so that those
configuration files are removed on the removal of the subordinate charm.
Add the 'docs' key and point it at a Discourse topic
previously populated with the charm's README contents.
When the new charm revision is released to the Charmhub,
this Discourse-based content will be displayed there. In
the absense of the this new key, the Charmhub's default
behaviour is to display the value of the charm's
'description' key.
Add 23.04 run-on base and add lunar to metadata.yaml.
Drop 22.10 run-on base and drop kinetic from metadata.yaml.
Additional changes to ensure charm build is successful on focal.
