Add an announcement banner file for inclusion on the docs (astropy#636)

Cadair · web-flow · commit 5d0968e09be5 · 2024-10-28T10:39:38.000-04:00
* Add an announcement banner file for inclusion on the docs

* More links and words
diff --git a/annoucement_banner.html b/annoucement_banner.html
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+The <a href="https://ui.adsabs.harvard.edu/abs/2013A%26A...558A..33A/abstract">First Astropy Paper</a> recently <a href="https://www.astropy.org/paper1_10k_citation.html#astropy-paper-reaches-10-000-citations-article">hit 10,000 citations</a>. Thanks to everyone who has cited the paper and contributed to Astropy. <a href="https://www.astropy.org/contribute.html">Join Us</a> for the next 10,000!

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	`1`	`+The <a href="https://ui.adsabs.harvard.edu/abs/2013A%26A...558A..33A/abstract">First Astropy Paper</a> recently <a href="https://www.astropy.org/paper1_10k_citation.html#astropy-paper-reaches-10-000-citations-article">hit 10,000 citations</a>. Thanks to everyone who has cited the paper and contributed to Astropy. <a href="https://www.astropy.org/contribute.html">Join Us</a> for the next 10,000!`