multiple bugs in context with homepage and preview

- enable save after remove block
- remove delete from toolbar on homepage
- when on homepage click on homepage in navigation form and preview stays open

__Tasks:__

- [ ] test coverage
- [ ] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tests pass?   | [yes|no => <WHY?>]
| Fixed tickets | [<WHICH?>|none]
| Doc           | none