feat: add weblate_url in settings model

[sachinchauhan2889]

Fixes #fossasia/open-event-frontend#5635

required for this PR fossasia/open-event-frontend#5656

Short description of what this resolves:

Add another option to add a link to Weblate to the Footer.

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

[snitin315]

Looks Good. I believe the PR title should be modified.

[snitin315]

feature feat

[codecov]

Codecov Report

Merging #7451 (3844be1) into development (b56f9c9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development    #7451   +/-   ##
============================================
  Coverage        65.34%   65.35%           
============================================
  Files              265      265           
  Lines            13229    13231    +2     
============================================
+ Hits              8645     8647    +2     
  Misses            4584     4584           

Impacted Files	Coverage Δ
app/api/schema/settings.py	100.00% <100.00%> (ø)
app/models/setting.py	95.16% <100.00%> (+0.03%)	⬆️

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