Rename CI/CD Pipelines references to just Pipelines in docs

app/views/projects/builds/index.html.haml

app/views/projects/pipelines_settings/_show.html.haml

doc/ci/README.md

doc/ci/examples/deployment/README.md

doc/ci/examples/test-scala-application.md

doc/ci/triggers/README.md

doc/ci/variables/README.md

doc/user/permissions.md

doc/user/project/new_ci_build_permissions_model.md

doc/user/project/pages/getting_started_part_two.md

doc/user/project/pipelines/settings.md