Fix rules formatting + redirect

[AndyRae]

Changes

• Fix rules formatting json mentioned in #818
• Adds middleware for redirecting a non-authed user
• Adds a redirect on the home page to /scanreports
• Adds a root error, and not-found page

Checks

Important: please complete these before merging.

• [x] Run migrations, if any.
• [x] Update changelog.md, including migration instructions if any.
• [x] Run unit tests.

[github-actions[bot]]

Tests	Skipped	Failures	Errors	Time
25	1 :zzz:	1 :x:	0 :fire:	4.159s :stopwatch: