When acting on GitHub webhooks, only publish if docs content was modified
Created by: seanmadsen
Now that we have books being published from repos with actual code (in addition to just docs) I think it'd be nice to avoid the server load (and unnecessary notification emails) of re-publishing books when non-docs changes are made to the repo. For example, if an extension's maintainer makes a code change to their extension, civicrm-docs will currently re-publish the book and send a notification email every time. We could check the paths modified and publish only if we see /docs or /mkdocs.yml