Update 6.9-to-7.0.md

fix gitlab.yml example diff command
fix high cpu usage issue that occured in Firefox

fixes issue related with #342 (Merge Request view causes 100% CPU in firefox)
Gitlab::Git::Compare in Satellite::CompareAction
Integrate lessons from the latest release.
Add a tip on how to test regular expressions
Most starred projects page for Explore area

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Moved some behaviour to one place

Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>
Tests for trending/starred pages

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'most-starred' into 'master'

Most starred projects page

Fixes #1461

See merge request !996
Merge pull request #7319 from jvanbaarsen/small-eventcache-refactoring

Moved some behaviour to one place
Add missing semicolon in application.scss
Merge branch 'add-merge-moments-to-process' into 'master'

Add merge moments to process

Fixes #1450

See merge request !986
Merge branch 'test_regex_with_rubular' into 'master'

Add a tip on how to test regular expressions

See merge request !994
Merge branch 'fix_typo_application_scss' into 'master'

Add missing semicolon in application.scss

Was toying to import some custom css and found out about this :)

See merge request !157
Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce
Do not execute hooks on empty projects, fixes #6108
7.2 started
Improve markup gems
Add omnibus-gitlab to the monthly release process
Only redirect to referrer from public GitLab pages