docs: Update README.md

[Anshgrover23]

Fixes: #2216

Description

There are some Broken links in readme.md

Changes

I have changed the broken links attached to white labelling, CSS Variables for non-React Projects and Rfcs in readme.md file

Component Checklist

• Perform Manual Testing in Other Browsers

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[saurabhdaware]

can you fix these links as well? seems like they are broken too

[Anshgrover23]

@saurabhdaware done. changed that broken links as well

[saurabhdaware]

Thanks for your contribution 🏅

[Anshgrover23]

@saurabhdaware when it will get merged may i know sir?

[saurabhdaware]

@saurabhdaware when it will get merged may i know sir?

Now 🤭 Sorry I was in meeting.

[Anshgrover23]

@saurabhdaware no worries and thanks for merging brother.