Allow only digits on the OTP fields

[DeeTheDev]

Fixes #762

When any non-digit values is detected, reset the value to the previous value - effectively preventing non-digits from being inputed.

• Fix aria-label to use markdown ex: "Enter code 1"
• Use input type numbers

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.77%. Comparing base (ee4a62e) to head (b6b35c9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #763      +/-   ##
==========================================
- Coverage   98.77%   98.77%   -0.01%     
==========================================
  Files         478      478              
  Lines       21928    21942      +14     
==========================================
+ Hits        21660    21673      +13     
- Misses        268      269       +1     

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