[Bug 2084159] [NEW] Modernize the ReleaseAnnouncement to point to more modern means of communications

[Skia]

Public bug reported:

It was noted during the Oracular release that the release announcement
is a bit oldish when it comes to the "questions" section.

For example: http://archive.ubuntu.com/ubuntu/dists/oracular-
proposed/main/dist-upgrader-all/current/ReleaseAnnouncement

* This is pointing to IRC first, and nothing is mentioning Discourse [1] nor Matrix [2].
* Remove the `www` prefix to all ubuntu.com links, it's no longer needed, and redirects anyway.
* Make all the links HTTPS.

[1]: https://discourse.ubuntu.com/
[2]: https://ubuntu.com/community/communications/matrix

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
     Assignee: Skia (hyask)
         Status: New

** Changed in: ubuntu-release-upgrader (Ubuntu)
     Assignee: (unassigned) => Skia (hyask)

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https://bugs.launchpad.net/bugs/2084159

Title:
  Modernize the ReleaseAnnouncement to point to more modern means of
  communications

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  It was noted during the Oracular release that the release announcement
  is a bit oldish when it comes to the "questions" section.

  For example: http://archive.ubuntu.com/ubuntu/dists/oracular-
  proposed/main/dist-upgrader-all/current/ReleaseAnnouncement

  * This is pointing to IRC first, and nothing is mentioning Discourse [1] nor Matrix [2].
  * Remove the `www` prefix to all ubuntu.com links, it's no longer needed, and redirects anyway.
  * Make all the links HTTPS.

  [1]: https://discourse.ubuntu.com/
  [2]: https://ubuntu.com/community/communications/matrix

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