Removed links to old forum

[tagawa]

Description :

In our feedback flow, we're currently sending people with feature ideas to the old (closed) forum. This PR changes that to the DDG subreddit.

Reviewer notes :

References issues / PRs:

#

Who should be informed of this change?

@moollaza

Does this change have significant privacy, security, performance or deployment implications?

No

Checklist :

• [ ] Back end tests (perl, scripts)
• [ ] Front end tests (js, integration)
• Browser verification
  • [ ] IE
  • [ ] Chrome
  • [ ] Firefox
  • [ ] Safari
  • [ ] Opera
• Mobile verification
  • [ ] iOS
  • [ ] Android

[jbarrett]

👍