Redirect files can be deleted after 3 months, but
the deletion should follow the process defined
in the docs processes.

Find and replace the old Container Scanning paths

Updates docs for MR and Group security dashboard

Also mention the 30,60,90 days window.

This reverts merge request !10044

- Capitalises Dependancy Scanning
- Swaps an 'at' for an 'on'

- Adds references to the dependency scanning features
- Updates the images to reflect the new layout
- Adds a small section about the new filters