insights: Correctly align and display Insights status
insights: Correctly align and display Insights status

This commit includes:

- Removing of leading whitespace
- Adding icon as it is external link
- Adding `target` and `rel` attributes to the link
cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,mvollmer/cockpit,martinpitt/cockpit,mvollmer/cockpit,mvollmer/cockpit,martinpitt/cockpit,martinpitt/cockpit