[BEAM-11515] Add check for missing authors, add missing authors #13599
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I noticed that we were missing a lot of author definitions (including my own) when I wrote the DataFrame blog post. This prevents them from rendering:

This PR adds a check to fail the website build if an author isn't defined, and adds the missing authors.
It also adds

<!--more-->tags to release blog posts so they break correctly. Otherwise they are broken on the first '.' in the version number:Post-Commit Tests Status (on master branch)
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