backport changelog entries from 1.0.0 and updates to 1.1.0~rc1

[kushaldas]

Status

Ready for review

Description of Changes

Adds the changelog entries from 1.0.0 release and
updates release to 1.1.0~rc1

[emkll]

Thanks for the backport @kushaldas!

1. It seems like molecule/shared/stable.ver changes were not backported [0] , this is required for upgrade boxes. I just checked, and the stable.ver file was correctly updated in the release branch [1].
2. In the past, we've committed each rc commit for posterity in develop (see [2]). Could you please add the commits for rc2,3 and 4? They won't affect the diff but it would be good to have them.

[0] https://github.com/freedomofpress/securedrop/blob/backport_changelog_1/molecule/shared/stable.ver#L1
[1] https://github.com/freedomofpress/securedrop/blob/release/1.0.0/molecule/shared/stable.ver
[2] https://github.com/freedomofpress/securedrop/pull/4389/commits

[codecov-io]

Codecov Report

Merging #4840 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #4840   +/-   ##
========================================
  Coverage    81.74%   81.74%           
========================================
  Files           49       49           
  Lines         3418     3418           
  Branches       392      392           
========================================
  Hits          2794     2794           
  Misses         533      533           
  Partials        91       91

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[emkll]

Looks good to me, thanks @kushaldas , good to merge when CI passes.

There's a seemingly unrelated app error /flake in https://circleci.com/gh/freedomofpress/securedrop/34576 , which we should restart and ensure it passes prior to merge.