Fixed six broken links in README.md

See merge request gitlab-org/gitlab-ce!19797

Rails5 ActionController::ParameterMissing: param is missing or the value is…

Closes #47805

See merge request gitlab-org/gitlab-ce!19763

Rails5 fix no implicit conversion of Hash into String

Closes #47835

See merge request gitlab-org/gitlab-ce!19792

Rails5 fix stack level too deep

Closes #47804

See merge request gitlab-org/gitlab-ce!19762

Fix branch name encoding for dropdown on issue page

Closes #47472

See merge request gitlab-org/gitlab-ce!19634

Remove the btn-xs class from the stylesheets

Closes #46743

See merge request gitlab-org/gitlab-ce!19719

Rails5 fix no implicit conversion of Hash into String. ActionController::Parameters no longer returns an hash in Rails 5

Resolve "Merge request diff loading icon not visible"

Closes #47830 and #47849

See merge request gitlab-org/gitlab-ce!19758

Remove card class from the git-empty containers

Closes #47847

See merge request gitlab-org/gitlab-ce!19785

Bring changes from EE for parallel_importer.rb

See merge request gitlab-org/gitlab-ce!19779

Flex board columns

See merge request gitlab-org/gitlab-ce!19250

Render access denied without message

Closes #47844

See merge request gitlab-org/gitlab-ce!19755

Add support for verifying remote uploads, artifacts, and LFS objects in check rake tasks

Closes #47139

See merge request gitlab-org/gitlab-ce!19501

QA: Only clear the sessions if there's no error with a block

Closes gitlab-qa#197

See merge request gitlab-org/gitlab-ce!19751

Database migrations should have a changelog entry.

See merge request gitlab-org/gitlab-ce!19703

Removes merge conflicts vue code from globalnamespace

See merge request gitlab-org/gitlab-ce!19750

Rails5 ActionController::ParameterMissing: param is missing or the value is empty: application_setting

Fix UX handbook link in contribution guide

See merge request gitlab-org/gitlab-ce!19738

ListCommitByOid isn't called with an empty batch

See merge request gitlab-org/gitlab-ce!19753

Use Gitaly 0.105.1

See merge request gitlab-org/gitlab-ce!19739

Resolve "Board list creation is broken"

Closes #47823

See merge request gitlab-org/gitlab-ce!19746

The `errors/access_denied` page should not fail to render when no
message is provided.

When accessing something as a sessionless user, we should also display
the terms message if possible.

Because otherwise capybara-screenshot/rspec can't
take the screenshots for us. If we got an error,
we don't want to continue anyway?

resolving MR 19611-fix/enhance start-using-git doc

See merge request gitlab-org/gitlab-ce!19619