Resolve "Fold onlyoffice chart into nextcloud-onlyoffice"

Before you merge this, please make sure that you:

• Updated chart version number
• Manually tested chart changes with the openappstack bootstrap script
• Created an MR in openappstack/openappstack that applies the changes from this MR (openappstack!137)
• Tests in that MR in openappstack/openappstack succeed

Closes #27 (closed)