* fix: Enforce naming of charter docs in submit()
* style: Reformat submit() with Black
* refactor: Remove redundant check of charter name
* style: Reformat charter_with_milestones_txt with Black
* refactor: Drop canonical_name, use Path in charter_with_milestones_txt
* style: Reformat review_announcement_text() with Black
* style: Reformat action_announcement_text() with Black
* refactor: Change uses of charter.canonical_name() to charter.name
* refactor: Skip docialias when retrieving charter
* refactor: Change canonical_name() to name in utils_charter.py
* refactor: Use Path in read_charter_text()
* refactor: Drop canonical_name, minor refactor of tests_charter.py
* refactor: charter.name instead of canonical_name in milestones.py
* refactor: charter.name instead of canonical_name in tests_info.py
* refactor: Remove unused functions in ietf/secr/utils/groups.py
* refactor: charter.canonical_name -> charter.name in templates
* refactor: Remove charter handling from canonical_name
Temporarily raise an exception for testing
* refactor: Refactor get_charter_text() without canonical_name
* refactor: Remove raise when canonical_name called on a charter
* fix: Add back missing ".txt" extension
* test: Test rejection of invalid charter names