Combine dark and regular logo in README.md

[pyatizbyantsevia]

Changes

Since the paths between the repositories to assets/ are different, the working version can be viewed on the master branch of my fork.

It might be worth creating a logo in .svg format so as not to have 2 files and encapsulate all the logic inside the svg, as in design-library-plugin

To check the functionality, you can open two tabs: master branch in my fork, appearance settings. By switching the style on the appearance tab and then refreshing the fork page, you can see the functionality

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• Includes tests (if functionality changed/added)
• Includes docs (if user facing)
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Describe any user facing changes here, or delete this block.

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[pyatizbyantsevia]

If this PR is accepted, then before the merge I would be very grateful if there was a label for Hacktoberfest (hactoberfest-accepted)

[pyatizbyantsevia]

@brokenpip3, could you take a look?

[brokenpip3]

Yes, sorry will take a look during this week

[brokenpip3]

thanks for your contribution

[pyatizbyantsevia]

Thank you! Sorry, I made a mistake in the label name, it should be "hacktoberfest-accepted", missed the 'k'.
Thanks again!

[brokenpip3]

done