Merge branch 'fix-aai-post' into 'master'

update excerpt to eliminate links

See merge request !605

_posts/2022/2022-08-26-aai.md

@@ -14,7 +14,7 @@ tags:
   - Announcement
   - Helmholtz AAI
 excerpt: >
-  The [German Center for Neurodegenerative Diseases](https://www.dzne.de/en/) (DZNE) and the [GSI Helmholtz Centre for Heavy Ion Research](https://www.gsi.de/en/start/news) joined the [Helmholtz AAI](https://aai.helmholtz.de/).
+  Time to celebrate: With the last two centres having joined recently, all 18 Helmholtz Centres and the Head Office are now using the Helmholtz-wide Authentication and Authorisation Infrastructure, the Helmholtz AAI!
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