404 redirect

[whiteheadol]

New feature/Improvement/Bug fix: 404 redirect for homepage

When a user tries to visit a page that doesn't exist from Policy Engine's base url, they will now see a 404 message telling them that the page they're trying to visit doesn't exist. Ex: attempting to visit http://policyengine.org/some-non-page will display this message.

• [x] Added a new entry to changelog.yaml (undated).

Status

• [x] Cosmetic change
  • [x] Screenshots attached

• [ ] Back-end change
  • [ ] Unintuitive logic commented
• [ ] Version change
  • [ ] Major
  • [ ] Minor
  • [ ] Patch

Issues fixed

Closes #360