Remove provider column from app overview

Since we don’t have the data to display this nicely. Because the app
name already includes the provider name and we don’t want to show it
twice.
Add icons to app detail’s menu

Show icons in the left navigation menu on the app details page.
Fix connect button on app overview page

Click handler for connect button was incorrect and propagated to the
click handler on the `tr`. The button now redirects the user to the
how to connect page. The row itself redirects to the app detail page.