feat: Add yellowdark theme

[ghost]

Description

Added new yellowdark theme.

Type of change

• Updated documentation (updated the readme, templates, or other repo files)

How Has This Been Tested?

• Tested locally with a valid username
• Tested locally with an invalid username
• Ran tests with composer test
• Added or updated test cases to test new features

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Screenshots

With border

Without border

This are a screenshots from the demo site.

[DenverCoder1]

I find this pallete to be a bit similar to javascript-dark and great-gatsby but I feel the primary red seems to stand out a lot.

Maybe a shade of orange for the fire could be better, or possibly a duller red or matching yellow?

Feel free to let me know what you think. 👍

Additionally, the image for the docs can be obtained by doing a right-click on the picture on the demo site and copy in order to avoid having the extra white-space around the border.

[ghost]

Perhaps. I'll try to change the color of the fire.

Thanks for the advice!

[ghost]

How about this?

[DenverCoder1]

Looks good 👍

I'll merge it when the code and docs are updated.

[ghost]

Okay.

[ghost]

I have updated the code and docs.

[DenverCoder1]

Thanks for the contribution 🎉