Convert the Messengers page to HTML admonitions

[rollsicecream]

Changes proposed in this PR:

• Convert the "Real-Time Communication" page, a.k.a. Messengers to use the new HTML admonitions.

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Lighthouse	4 paths audited Performance: 71 (🔴 down 3 from production) Accessibility: 91 (🔴 down 1 from production) Best Practices: 98 (no change from production) SEO: 88 (no change from production) PWA: - View the detailed breakdown and full score reports

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[dngray]

This one was already in the queue #2377

[privacyguides-bot]

This pull request has been mentioned on Privacy Guides. There might be relevant details there:

https://discuss.privacyguides.net/t/v3-20/16594/1