Rename source/API_Reference/Webhooks/index.html to source/API_Reference/Webhooks/glossary/event_webhook.html

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Merge branch 'patch-1' of https://github.com/mthizzy/docs into mthizzy-patch-1
Moved the file back and removed the glossary subdir
added this file back where it should be
Merge branch 'mthizzy-patch-1' into develop