Add dark color to github icon in footer

[BSlaven]

Closes #1072

Changes proposed

I added a dark color as className. But there is not black color as a utility (at least I did not find it). I added 'text-gray-900'.

One way to add black could be to use inline style as style={{ color: #000 }}.

There is a same icon in navbar. Should I change color of that one as well? Thoughts?

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.

Screenshots

from this:

to this:

[github-actions]

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[Panquesito7]

Hey there! Thanks for submitting a PR! 😄 Could you please show us a screenshot of how does it look before? Let us know if you need any help with anything. Thank you. :)

[BSlaven]

I've edited the PR body to show before and after this change.

[Panquesito7]

LGTM 🚀 Thank you for your contribution! 😄👍