MB 137: detailsURL and openURL attributes need to point to Mullvad Browser equivalents

Merge Info

Related Issues

• privacy-browser#137

• Backport Timeline

  • Immediate - patchsets for critical bug fixes or other major blocker (e.g. fixes for a 0-day exploit) OR patchsets with trivial changes which do not need testing (e.g. fixes for typos or fixes easily verified in a local developer build)
  • Next Minor Stable Release - patchset that needs to be verified in nightly before backport
  • Eventually - patchset that needs to be verified in alpha before backport
  • No Backport - patchset for the next major stable

• Issue Tracking

  • Link resolved issues with appropriate Release Prep issue for changelog generation

Change Description

Updated the detailsURL to point to future github.com release pages for the given build tag.

/cc @ruihildt