chore: cleanup sponsor sidebar

[thelostone-mc]

Description

noticed the hackathon nav on 13inch laptop while @vs77bb was sharing screen
The hackathon sponsor takes too much real estate

This PR cleans it up

• by shrinking the sponsor section
• fixing the wonky css where the sponsor logo overflows the white bg

Testing

LIVE: https://gitcoin.co/hackathon/clarity/?tab=hackathon:20

In 13inch screen:

This PR:

In 13inch screen:

In 15inch screen:

[codecov]

Codecov Report

Merging #6806 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6806      +/-   ##
==========================================
+ Coverage   26.65%   26.67%   +0.02%     
==========================================
  Files         294      294              
  Lines       28134    28134              
  Branches     4139     4139              
==========================================
+ Hits         7498     7504       +6     
+ Misses      20365    20364       -1     
+ Partials      271      266       -5     

Impacted Files	Coverage Δ
app/quests/views.py	16.22% <0.00%> (ø)
app/dashboard/views.py	10.61% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
...eting/management/commands/assemble_leaderboards.py	39.83% <0.00%> (ø)
app/dashboard/embed.py	31.60% <0.00%> (+3.44%)	⬆️

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