Refactor form if statement

* Replace ugly path unless with if form.object.persisted?
* So delete option only appears on edit
Clean up appearance of code
Styling and UX improvements

* Add divs and classes and edit CSS to improve appearance
* Add confirmation for deletion of surveys
* Improve HTML
Update hash syntax for classes
Merge pull request #12 from CHJ-Metis/ha-fixes

Styling and other minor fixes