Update maintainer's guide

Merge pull request anki-geo#395 from emiham/master

Add full stops to Swedish info fields

Amend release workflow to cover pre-release stage

Bump version number in deck description

Merge pull request anki-geo#284 from ukanuk/nobox-south_america

Rename ug-map-south_america with "-nobox" at end, fixes anki-geo#283

Update README and deck description for v3.3 release

Revert changes to publishing steps

Fix deck description markup

add map of Mount Athos

Fix anki-geo#61

Merge pull request anki-geo#56 from axelboc/misc

Various content changes