Hackathon changes

[octavioamu]

Description

Add flow if hackathon didn't started yet > redirect to onboard
Styles for all hackathon pages (new prize explorer)
Editable hackathon onboard
Add subscribe on hackathons list

Refers/Fixes

#5533
#5529

Testing

[codecov]

Codecov Report

Merging #5597 into master will decrease coverage by 0.04%.
The diff coverage is 10%.

@@            Coverage Diff             @@
##           master    #5597      +/-   ##
==========================================
- Coverage   30.22%   30.17%   -0.05%     
==========================================
  Files         248      248              
  Lines       21186    21248      +62     
  Branches     3068     3097      +29     
==========================================
+ Hits         6403     6412       +9     
- Misses      14507    14556      +49     
- Partials      276      280       +4

Impacted Files	Coverage Δ
app/app/urls.py	90.19% <ø> (ø)	⬆️
app/dashboard/models.py	56.3% <100%> (+0.01%)	⬆️
app/dashboard/views.py	12.79% <6.89%> (-0.09%)	⬇️
app/avatar/views_3d.py	18.42% <0%> (-0.07%)	⬇️
...rketing/management/commands/no_applicants_email.py	0% <0%> (ø)	⬆️

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