Fixes: #3112

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Co-authored-by: Saurabh Kumar <theskumar@users.noreply.github.com>

Fixes #3101

- Remove `make sort` and `make sort-fix` make targerts
- Use `make lint` and `make lint-fix` instead.
- Make use of GitHub Annotation to surface issues as annotations
directly in the files changed, similar to CodeQL.
- Move stuff from `setup.cfg` to `pyproject.toml`
- Fixed the potentially buggy code. Each of the fix types is in
individual commits.

Fixes #3079

Fixes #3074

The React app or "three column view" was built for an organisation that no longer use Hypha. No current implementors use it. Removing it simplifies Hypha quite a bit.

Co-authored-by: Saurabh Kumar <theskumar@users.noreply.github.com>