Improve demo site

[PsiKai]

Style improvements to Demo website

• Standardized layout
• Include PropsTable sections
• Better LoadingSpinner examples

Updates to the library

• Input component takes ReactNode type for text based props
• LoadingSpinner gets new backdrop prop
  • Setting to false makes the spinner behave as an inline-block element with no overlay
• Better test coverage
• Removal of redundant props in readmes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0e1905c) to head (48b451f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #23   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          166       167    +1     
  Branches        54        54           
=========================================
+ Hits           166       167    +1     

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