Removing an integration page

If you remove an integration, also remove the related integration documentation.

1. Delete the related integration documentation page and its related triggers, conditions, and actions, if applicable.
2. Remove the related logos and icons from the Brands repository.
3. Remove the entry in the codeowners file, as they did in this PR.
4. Add a 301 entry in the redirect file, in the section on Removed integrations.