Move "Install example data" to settings page

[nitech]

It's great that you have included the ability to add example data. But the button that lets you install example data is a little too available, in my opinion.

In my head it would make sense to move this button to the plugin's settings page (ie: /admin/settings/plugins/super-filter) so users don't accidentially add the example data.

[pdaleramirez]

Thank you for reporting this issue. I will improve the UI on that page and think of a better placement.