Move project services to new location under Integrations

app/views/shared/web_hooks/_form.html.haml

doc/README.md

doc/administration/integration/terminal.md

doc/api/services.md

doc/ci/autodeploy/index.md

doc/ci/environments.md

doc/ci/quick_start/README.md

doc/ci/variables/README.md

doc/integration/README.md

doc/integration/external-issue-tracker.md

doc/integration/jira.md

doc/project_services/bamboo.md

doc/project_services/bugzilla.md

doc/project_services/builds_emails.md

doc/project_services/emails_on_push.md

doc/project_services/hipchat.md

doc/project_services/irker.md

doc/project_services/jira.md

doc/project_services/kubernetes.md

doc/project_services/mattermost.md