chore: update earn info screen

[MuckT]

Description

• Uses the updated "Learn More" URL added in https://github.com/valora-inc/valora-app-branding/pull/36.
• Increases font size on the page based on early feedback.

iOS SE Before	iOS SE After

Test plan

• Tested locally on iOS

Related issues

Fixes ACT-1240

Backwards compatibility

Yes

Network scalability

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.47%. Comparing base (6d3e992) to head (add282d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5571      +/-   ##
==========================================
- Coverage   86.47%   86.47%   -0.01%     
==========================================
  Files         764      764              
  Lines       31496    31496              
  Branches     5452     5450       -2     
==========================================
- Hits        27236    27235       -1     
- Misses       4028     4029       +1     
  Partials      232      232              

Files	Coverage Δ
src/earn/EarnInfoScreen.tsx	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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