Different theme for stats/skills card

Is your feature request related to a problem? Please describe.

currently, stats/skills cards are by default white and you can't change them unless you change the code inside readme using &theme=" theme name"

Describe the solution you'd like

how about showing different themes under Add-ons and when the user select that theme,&theme is added in the code for example, let's say I selected the theme vue-dark so when I select that the line changes from:

to:

img align="center" src="https://github-readme-stats.vercel.app/api/top-langs?username=kuuhaku-u&show_icons=true&locale=en&layout=compact&theme=vue-dark" alt="kuuhaku-u"

Describe alternatives you've considered

we can enable editing in the markdown...this will be much easier than the above solution I think

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