Feature: Add the theme toggler(Dark/Light)

[AbhiDiva96]

Add the Theme toggler into the navbar

Dark theme: [#071931]
Light theme: [lavender]

shots

[github-actions]

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[nishant0708]

hey i can work on this issue

[pahuja-sahil]

@AbhiDiva96 I would like to work on this issue. I have made a blogging website link to which is given below. I can easily and efficiently create this theme toggler with given color pallete.
link - https://github.com/pahuja-sahil/Online-Blogging-System
Kindly assign this issue to me under gssoc .
Thank you.

[ayushpandey101]

hey! @AbhiDiva96 Iwant to work on this issue, can you assign this to me under GSSOC.

[kauxp]

If no one is working on this issue, could you please assign this to me.