Entity URL improvements

- Content URLs (profilePath) should be changed to `/content/<tenantid>/<contentId>`
- Group URLs (profilePath) should be changed to `/group/<tenantid>/<groupId>`
- User URLs (profilePath) should be changed to `/user/<tenantid>/<userId>`
- Group alias should no longer be passed into the group creation process, it should just generate a shortId instead. Later on, we can work out an alias system for groups and users. In the short term, this will also prevent groupId XSS attacks.