feat: back-to-top and article badges

[Novout]

• [x] Optional Back-to-top button

• [x] Optional badges in article frontmatter

• [x] Documentation for proposals

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Name	Status	Preview	Updated (UTC)
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[Tahul]

Hello @Novout :)

Excellent work, thanks for this!

I let you review the few changes I applied in my last commit for your future contributions, aside from these little things, this was very great!