fix projects activity, logo, and urls

[octavioamu]

Description

fix urls to point to single project pages
fix logo if doesn't exist default to org prize (as in the other areas)
fix new bounty rate hours estimate.

Refers/Fixes

Testing

[codecov]

Codecov Report

Merging #7286 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #7286      +/-   ##
==========================================
- Coverage   26.10%   26.10%   -0.01%     
==========================================
  Files         300      300              
  Lines       29696    29698       +2     
  Branches     4408     4409       +1     
==========================================
  Hits         7752     7752              
+ Misses      21672    21669       -3     
- Partials      272      277       +5     

Impacted Files	Coverage Δ
app/dashboard/views.py	10.43% <0.00%> (-0.01%)	⬇️
app/quests/views.py	16.22% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
...eting/management/commands/assemble_leaderboards.py	39.73% <0.00%> (ø)

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