Button hover effect

[Megha-Dev-19]

• I have deleted css.jsx files and move the themeColor to config, so we can utilise it as a constant and convert to hsl to get hover effect cover, and also use it in theme page
• Added hover effects to all buttons
  https://github.com/user-attachments/assets/eade6cfd-7feb-41db-9b6d-9885508de7bc
• Fixed some styling issues

[Megha-Dev-19]

@race-of-sloths include

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Current status: executed

Reviewer	Score
@petersalomonsen	5

Your contribution is much appreciated with a final score of 5!
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[petersalomonsen]

@race-of-sloths score 5