* master: (38 commits)
  Update bitbucket.md to fix typo and small grammar touchups.
  Update time_helper.rb to fix output for exact minutes.
  Document update for GitLab Pages users.
  Support manually stopping any environment from the UI
  Fix link to frontend in handbook
  Shorten CHANGELOG filename to avoid breaking ecryptfs users
  Replace 48976-rails5-invalid-single-table-inheritance-type-group-is-not-a-subclass-of-gitlab-backgroundmigration-fixcrossprojectlabellinks-namespace.yml
  Fix mountComponent helper path in docs
  Fix #48537 - Update avatar only via the projects API
  Add additional headline for Adding SSH keys to GitLab
  Request to be a proofreader.
  Fix specs
  Fix search bar text input alignment
  Fix API docs on unauthenticated projects return
  Adds with_projects optional parameter to /groups/:id API endpoint
  Docs: make it clear that you need a completely separate domain for Pages
  Document that we don't want to wait in tests
  Removes unused store in diffs mr refactor Removes double export for actions in diffs module in mr refactor
  Remove useless return
  Use latest gitlab-styles
  ...

Discussions were being toggled by jquery DOM querying them and toggling
visibility but in vue, only the open discussions will be in the DOM
Fix includes:
 - Adds a getter to the store to get the expanded discussions
 - Adds an action to collapse a discussion
 - When the user clicks the button, all data needed is now accessible
   through a getter and we can dispatch an action to toggle the discussion
   within the state, instead of showing/hiding with jQuery
 - Removes hardcoded properties

Resolves #48237

Update bitbucket.md to fix typo and small grammar touchups.

See merge request gitlab-org/gitlab-ce!20482

Update time_helper.rb to fix output for exact minutes.

Closes #48948

See merge request gitlab-org/gitlab-ce!20479

Document update for GitLab Pages users.

See merge request gitlab-org/gitlab-ce!20412

Fix API docs around unauthenticated projects return fields

See merge request gitlab-org/gitlab-ce!20477

Use Gitaly for fetches and creating bundles

Closes gitaly#387, gitaly#874, gitaly#750, and gitaly#665

See merge request gitlab-org/gitlab-ce!20490

Improve metadata access performance

See merge request gitlab-org/gitlab-ce!20493

Resolve "PUT /projects/:id : unable to update avatar alone"

Closes #48537

See merge request gitlab-org/gitlab-ce!20505

Resolve "API: /groups/:name query very slow for groups with many projects"

Closes #42415

See merge request gitlab-org/gitlab-ce!20494

Fix mountComponent helper path in docs

See merge request gitlab-org/gitlab-ce!20511

Support manually stopping any environment from the UI

Closes #25388

See merge request gitlab-org/gitlab-ce!20077

Resolve "MR refactor: All actions under diff module are being exported twice"

Closes #48951

See merge request gitlab-org/gitlab-ce!20499

Fix link to frontend in handbook

See merge request gitlab-org/gitlab-ce!20504

Shorten CHANGELOG filename to avoid breaking ecryptfs users

Closes #49038

See merge request gitlab-org/gitlab-ce!20512

[ci skip]

Closes #49038

Replace 48976-rails5-invalid-single-table-inheritance-type-group-is-not-a-subclass-of-gitlab-backgroundmigration-fixcrossprojectlabellinks-namespace.yml

Add additional headline for Adding SSH keys to GitLab

Closes #46395

See merge request gitlab-org/gitlab-ce!20507

Document that we don't want to wait in tests

See merge request gitlab-org/gitlab-ce!20502

Preserve the correct start/due dates on milestones when editing

Closes #41671

See merge request gitlab-org/gitlab-ce!20279

Remove badges from README.md in favor of GitLab badges feature

Closes #48895

See merge request gitlab-org/gitlab-ce!20447

Request to be a proofreader.

See merge request gitlab-org/gitlab-ce!19423

Rails5 mysql fix milliseconds problem in pull request importer spec

See merge request gitlab-org/gitlab-ce!20475

Use Gitaly's OperationService.UserUpdateBranch RPC

Closes gitaly#1252

See merge request gitlab-org/gitlab-ce!20231

Use the correct script location for the build trigger script

See merge request gitlab-org/gitlab-ce!20454

Update hamlit to fix ruby 2.5 incompatibilities, fixes #42045

Closes #42045

See merge request gitlab-org/gitlab-ce!20315

Fix search bar text input alignment

Closes #48288

See merge request gitlab-org/gitlab-ce!20155