Request faucet top-up on low balance

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

• Show a Request Faucet Top-up option instead of send button if available faucet balance is less than network drip amount
  

Reference issue to close (if applicable)

Closes #129

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code
  adheres to the team's
  documentation standards,
• I have added tests that prove my fix is effective or that my feature works
  (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes
  should be reflected in this document.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 9.95%. Comparing base (b49448a) to head (b8c9bbc).

Files with missing lines	Patch %	Lines
src/faucet/views.rs	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #135      +/-   ##
=========================================
- Coverage   10.02%   9.95%   -0.07%     
=========================================
  Files          25      25              
  Lines        1287    1296       +9     
=========================================
  Hits          129     129              
- Misses       1158    1167       +9     

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[LesnyRumcajs]

I like the button idea. I would've done it differently (block the send button and mention the top-up link in the description), but I think your approach is more user-friendly.