If checking the links in the documentation times out, don't fail the whole job.

Sometimes a website freezes. Now the checking for links step will time out 
after 60 minutes, but because of the continue-on-error: true the rest 
of the job should finish.

Probably we should pay more attention to the checking of links results anyway.
(And/or do it less often)

Author: rwest

.github/workflows/docs.yml

@@ -87,6 +87,7 @@ jobs:
 
       - name: Check documentation links
         continue-on-error: true
+        timeout-minutes: 60
         run: |
           cd documentation
           sphinx-build -b linkcheck -d build/doctrees/ source/ build/linkcheck | grep -e broken -e redirect | grep -v -e 'redirect  https://doi.org/' -e 'broken    https://doi.org/.* 403 Client Error: Forbidden'