Refactor landing page for grants

[SaptakS]

Description

Refactoring landing page based on @willsputra design.

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

Testing

Refers/Fixes

Refs: #2025 (comment)

[codecov]

Codecov Report

Merging #2944 into grants will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           grants    #2944   +/-   ##
=======================================
  Coverage   17.05%   17.05%           
=======================================
  Files         175      175           
  Lines       13864    13864           
  Branches     1813     1813           
=======================================
  Hits         2365     2365           
+ Misses      11491    11490    -1     
- Partials        8        9    +1

Impacted Files	Coverage Δ
app/grants/views.py	0% <ø> (ø)	⬆️
...eting/management/commands/assemble_leaderboards.py	25.5% <0%> (ø)	⬆️

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[thelostone-mc]

Fixed up mobile responsiveness and LGTM ^_^
Thanks @octavioamu for catching that :P