feat(grants): allow update of github project url

[chibie]

Description

Users are not able to edit github repo URL of a grant after creation.

This PR makes the github repo URL editable when "Edit Info" is clicked

Fixes

#7788

Testing

https://www.loom.com/share/dfb001c16bb44aac92bcf2914c71b672

[codecov]

Codecov Report

Merging #7818 into master will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #7818      +/-   ##
==========================================
+ Coverage   25.36%   25.38%   +0.01%     
==========================================
  Files         328      328              
  Lines       33082    33083       +1     
  Branches     4926     4926              
==========================================
+ Hits         8391     8397       +6     
+ Misses      24408    24403       -5     
  Partials      283      283              

Impacted Files	Coverage Δ
app/grants/views.py	11.22% <0.00%> (-0.01%)	⬇️
app/dashboard/embed.py	31.60% <0.00%> (+3.44%)	⬆️

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[danlipert]

Nice looks great! @chibie I'm wondering if we can make one small improvement to lengthen the input field to match the others on the form since it seems a bit small right now according to your video. What do you think?

[chibie]

@danlipert yes, this commit fixed that. the screen vid was made prior 😄