User comments & data import

[loleg]

We used dribdat to prepare data packages with a class of students at the Lucerne University of Applied Sciences and Arts. Part of this PR comes directly from their requests.

• The ability to comment on a project - in the sense of a review - even when you are not part of the team. See note (1)
• See related discussion in Voting on projects #87
• Attaching a Data Package in the same way as images, by uploading directly to a project.
• Import an event and its projects from a Data Package - as a template, or to mirror another site.
• The above resolves Import and export project data #214
• ALLOW_EVENTS enabled by default, so new (private) events can be started as a regular user.
• Additional extensive refactoring and de-linting has been done in the API modules.
• Minor usability fixes in the event and project views, and a revamp of the login screen.
• The documentation has been updated and refactored, with detailed docs in the docs/ subfolder. See note (2)
• There should be a video game hidden somewhere in the application 👾

Screenshot of a comment from a user above a log entry from a team member.

Notes 🚧

(1) If you see errors in your dribs view, reapply the last two database migrations, or run these SQL commands:

ALTER TYPE activity_type ADD VALUE 'boost';
ALTER TYPE activity_type ADD VALUE 'review';

This will only affect upgrades from very recent dribdat installations.

(2) Apologies about breaking some documentation links. GitHub isn't going to help us here, but link checkers will.

[codecov-commenter]

Codecov Report

Merging #267 (f9da2fd) into main (66e50ec) will decrease coverage by 3.76%.
The diff coverage is 16.95%.

@@            Coverage Diff             @@
##             main     #267      +/-   ##
==========================================
- Coverage   45.70%   41.93%   -3.77%     
==========================================
  Files          29       30       +1     
  Lines        2888     3238     +350     
==========================================
+ Hits         1320     1358      +38     
- Misses       1568     1880     +312     

Impacted Files	Coverage Δ
dribdat/admin/views.py	33.79% <0.00%> (-0.16%)	⬇️
dribdat/apievents.py	15.15% <0.00%> (-3.04%)	⬇️
dribdat/app.py	83.33% <0.00%> (ø)
dribdat/user/constants.py	34.86% <0.00%> (-0.33%)	⬇️
dribdat/user/models.py	48.81% <8.42%> (-8.18%)	⬇️
dribdat/apifetch.py	15.59% <8.51%> (-0.98%)	⬇️
dribdat/aggregation.py	9.93% <9.52%> (-0.92%)	⬇️
dribdat/apipackage.py	10.15% <10.15%> (ø)
dribdat/public/api.py	29.67% <16.66%> (-2.88%)	⬇️
dribdat/apiutils.py	19.76% <19.35%> (+0.58%)	⬆️
... and 5 more

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[loleg]

Deployed for testing at meta. E.g. see my comment on the Log at https://meta.dribdat.cc/project/41