Implement dark mode for CARE

[shivankacker]

Implement Dark Mode for care.

• Do not use the tailwind dark: classes (not worth the pain)

• Convert present classes into secondary, primary and other colors. Then let javascript decide what colors they refer to.

• This will allow more themes to be configured.

• I write this while staring into a white screen in the middle of the night.

[shauryag2002]

I want to work on this . please assign this to me.

[shivankacker]

@shauryag2002 I will be taking this up

[bodhish]

It should support multiple themes just like Github.

[shivankacker]

Blocked, should be taken up later on as discussed with Bodhi