Adding theme button

[himanshu007-creator]

I'm submitting a ... (check one with "x")

• bug report
• feature request
• support request

Current behavior:
Currently, website looks good, but adding a theme button will make it look awesome

Expected behavior:
It should have aq theme button to set mood for healthy eyes
Steps to reproduce:

Related code:

insert any relevant code here else remove this section

Other information:

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