feat: redirect to hackathon list for incorrect URL

[thelostone-mc]

Refers/Fixes

closes #5528

Testing

https://share.vidyard.com/watch/hAuHoXdRuZjB3ALFFs6qNA?

[codecov]

Codecov Report

Merging #5552 into master will increase coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #5552      +/-   ##
==========================================
+ Coverage   30.25%   30.28%   +0.02%     
==========================================
  Files         247      247              
  Lines       21073    21073              
  Branches     3048     3048              
==========================================
+ Hits         6375     6381       +6     
+ Misses      14422    14416       -6     
  Partials      276      276

Impacted Files	Coverage Δ
app/dashboard/views.py	12.88% <0%> (ø)	⬆️
app/dashboard/embed.py	31.6% <0%> (+3.44%)	⬆️

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