Participant search and event performance

[loleg]

• Data Package minor fixes.
• Participant search form (screenshot below)
• Gravatar not-found icons are "retro" (requires socializing to deploy)
• Improved event screen performance.
• Projects are showing their score again in the hexboard.
• Fixes to APIs.
• Dependency updates.

[codecov]

Codecov Report

Merging #355 (8f7ac54) into main (873d9e2) will increase coverage by 0.47%.
The diff coverage is 78.18%.

❗ Current head 8f7ac54 differs from pull request most recent head 195e519. Consider uploading reports for the commit 195e519 to get more accurate results

@@            Coverage Diff             @@
##             main     #355      +/-   ##
==========================================
+ Coverage   55.98%   56.45%   +0.47%     
==========================================
  Files          41       41              
  Lines        4330     4366      +36     
==========================================
+ Hits         2424     2465      +41     
+ Misses       1906     1901       -5     

Impacted Files	Coverage Δ
dribdat/public/views.py	60.00% <62.50%> (+3.06%)	⬆️
dribdat/aggregation.py	46.73% <100.00%> (+8.31%)	⬆️
dribdat/app.py	89.25% <100.00%> (+0.86%)	⬆️
dribdat/settings.py	97.00% <100.00%> (+0.03%)	⬆️
dribdat/user/models.py	75.43% <100.00%> (-0.55%)	⬇️

... and 3 files with indirect coverage changes

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