[deployment] The seeded pages don't have an URL on the first deployment

**Describe the bug**
When deploying a new instance, the pages generated at the beginning can't be accessed because they don't have a URL. This can be easily solved by saving the page, but it may not be so intuitive for people.

**To Reproduce**
Steps to reproduce the behavior:
1. On a fresh instance, go to `pages` in the admin menu
2. Click on the dropdown on the down arrow of a page item
3. Click on `View`/`Vezi`
4. This leads to a 404 page

**Expected behavior**
When clicking on `View` on a published page, it's expected to be able to view the page.