fixed sticky-top because new hacker town square post card

[developerfred]

Description

simple fixed z-index position

Refers/Fixes

• z-index

• nav-badge

Testing

Nav-badge

[codecov]

Codecov Report

Merging #7089 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7089      +/-   ##
==========================================
+ Coverage   26.28%   26.30%   +0.02%     
==========================================
  Files         300      300              
  Lines       29359    29359              
  Branches     4321     4321              
==========================================
+ Hits         7718     7724       +6     
+ Misses      21365    21364       -1     
+ Partials      276      271       -5     

Impacted Files	Coverage Δ
app/quests/views.py	16.22% <0.00%> (ø)
app/dashboard/views.py	10.57% <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)
app/dashboard/embed.py	31.60% <0.00%> (+3.44%)	⬆️

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