We started doing this for install docs in de2a2d0df, because `latest`
wasn't suitable and because I didn't know about readthedocs's `stable`
feature. The result has been that even with a checklist item, we
don't reliably update the link.
Instead, use the special `stable` version identifier on readthedocs to
link automatically to the highest version it knows about.
The markdown files in this directory ( /zulip/docs ) are not intended
to be read on GitHub. Instead, visit our
ReadTheDocs to
read the Zulip documentation.
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