create a " Darkmode" for whole website

[Arisha2902]

@dhairyagothi sir,

I will create a "darkmode" button in navbar, which will change the background to black.

It do will change the background to black but I will also assign a theme to whole website for all pages, I will give same hover effect and box shdow effect in dark mode also for all pages.

Things I will do:-

1. create a "Darkmode " Buttton.
2. Create a dark mode for all pages.
3. make hover and transition effect to all cards and items(items which have hover or any other effect now will have effect in darkmode
   also).

(you can decide the color of your theme and wheter to keep your theme or not).
screenshot is for blue theme but if you want it can be in red theme as well.

priview :-

377200243-3c2824bd-01b1-4756-ba84-a02dbdacc7ad.mp4

[github-actions]

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[Arisha2902]

@dhairyagothi, please assign me with this issue