feat(www): add rss and atom feeds to blog

[AnInternetTroll]

Summary

Adds RSS and Atom links on the blog page

Centered to be symmetrical with the heading and paragraph
Using buttons because simple links looked a bit weird and "empty" or "naked"
Lastly, hardcoded text. "RSS" and "Atom" is the same across languages as far as I'm aware

If anyone got tips for design let me know /shrug

closes: #4530

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🦋 Changeset detected

Latest commit: 0948e13

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@digdir/designsystemet-react	Patch
@digdir/designsystemet	Patch
@digdir/designsystemet-css	Patch
@digdir/designsystemet-types	Patch
@digdir/designsystemet-web	Patch

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[mrosvik]

Thanks for the suggestion! I’m wondering if we should instead place the links to RSS and Atom in the introduction. That way we avoid 2 CTA-buttons and also get them higher up. :)

<p class="ds-paragraph" data-variant="default" data-size="lg">Her vi deler innsikt fra arbeidet vårt, erfaringer fra brukere, og nyheter om endringer og forbedringer i Designsystemet. Du kan abonnere på bloggen gjennom <a href="...">RSS</a> eller <a href="...">Atom</a>. </p>

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[AnInternetTroll]

Thanks! Added the links up there