Added Dynamic text for switching between light and dark mode

[ShashwatMDas]

Beside the toggle button, added dynamic text changing ability for dark and light mode

[welcome]

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[shubhank-saxena]

Thank you @ShashwatMDas for this PR. Could you attach the outcome screenshot after your changes?

[ShashwatMDas]

Thank you @ShashwatMDas for this PR. Could you attach the outcome screenshot after your changes?

Yeah sure. @shubhank-saxena

Previous behavior,

Current behavior,

[SabhyaGrover]

@ShashwatMDas can you retain the text of URL Shortner as well ?

[ShashwatMDas]

Okay sure! Can you merge this PR and I'll create another one with the change?

[shubhank-saxena]

@SabhyaGrover I had merged a PR which has fixed the text and the overall appearance of the navbar. So we can move ahead with this PR.
@ShashwatMDas this looks good to me. Just fix the merge conflicts and we are good to go 🚀