* master:
  Add CI permissions and api links to README [ci skip]
  Remove duplicate documentation links
  make migrations reversible
  Add missing stage to builds view
  CI details cleanup
  Allow groups to appear in the search results if the group owner allows it
  Update installation.md
  update example of regex for pytest-cov

Add CI permissions and api links to README



See merge request !1756

Make migrations reversible



See merge request !1753

Add some polish to CI integration

Check the list of commits to see what I changed.

cc @dzaporozhets

@rspeicher I'd love to get this into 8.1, since it's mostly refactoring/tweaking of stuff that was _introduced_ in 8.1.

Fixes #2645.

See merge request !1641

- Add page titles to CI settings.
- Fix CI admin navigation.
- Remove duplicated scope.
- Use monospace font for commit sha.
- Add page title and header title to build page.
- Proper authorization for cancel/retry builds.
- Use gitlab pagination theme for builds and group members.
- Don't paginate builds widget on build page.
- Add badges to commit page Changes/Builds tabs.
- Add "Builds" to commit Builds tab page title.
- Add and use Ci::Build#retryable? method.
- Add CI::Build#retried? method.
- Allow all failed commit builds to be retried.
- Proper authorization for cancel/retry all builds.
- Remove unused param.
- Use time_ago_with_tooltip where appropriate.
- Tweak builds index text
- Remove duplication between builds/build and commit_statuses/commit_status.
- Use POST rather than GET for canceling and retrying builds.
- Remove redundant URL helpers.
- Add build ID to build page.
- Link branch name on build page.
- Move commit/:sha/ci to commit/:sha/builds.

Allow groups to appear in the search results if the group owner allows it

https://dev.gitlab.org/gitlab/gitlabhq/issues/2565

See merge request !1751

update example of regex for pytest-cov



See merge request !1745

* master: (23 commits)
  Use single spaces
  Improvements to profile page UI
  Replace all usages of `git` command with configurable binary path
  Update Shell Commands doc for configurable git binary path
  Minor reformatting for Facebook integration doc
  Use proper labels for OAuth providers
  Add Facebook authentication
  Bump stamp to ~> 0.6.0
  Add extra padding between user description and links on profile page
  Fix tests
  Fix clipboard button overflow
  Apply new design for user profile page
  Improve profile page UI
  Better name for up-level links
  Fixed User sorting specs
  Only sort by IDs by default
  Added benchmark for User.all
  Add changelog entry for contacted_at
  Spread out runner contacted_at updates
  Only redirect to homepage url when its not the root url
  ...

fixed typo in installation manual

Add Facebook authentication

See merge request !1740

Replace all usages of `git` command with configurable binary path

Closes #3311

See merge request !1742

Only redirect to homepage url when its not the root url

It was possible to create an infi redirect when the user set up the
`home_page_url` to redirect to the main URL of the gitlab instance.

This fix makes sure this redirect is not possible.

Fixes #1020 

/cc @dblessing 

See merge request !1703

Improvements to profile page UI

* add separator between tabs
* show project avatars
* fix tooltip offset on user calendar
* remove gray hover for tabs
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

For #3042

See merge request !1747

* add separator between tabs
* show project avatars
* fix tooltip offset on user calendar
* remove gray hover for tabs
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Improve performance of creating projects



See merge request !1650

Remove duplicate orders

This changes the default order from `created_at DESC, id DESC` to just `id DESC` as this achieves the same results without the overhead of having to sort data twice (we've seen queries go from 200ms to just a few ms by removing the double sort).

cc @jacobvosmaer @dzaporozhets @rspeicher @DouweM 

See merge request !1735

Bump stamp to ~> 0.6.0

Closes #2801

See merge request !1732

Closes #3311

[ci skip]

When project is updated and it is a fork, then visibility_level
should not be less restrictive than in its parent project.

Closes #2801

Spread out runner contacted_at updates

This is meant to prevent having too many concurrent UPDATE requests
caused by runners checking in.

See merge request !1722