Clean up docs redirects - 2022-02-22

doc/administration/database_load_balancing.md

doc/administration/geo/replication/using_a_geo_server.md

doc/administration/package_information/deprecated_os.md

doc/ci/runners/build_cloud/linux_build_cloud.md

doc/ci/runners/build_cloud/macos/environment.md

doc/ci/runners/build_cloud/macos_build_cloud.md

doc/ci/runners/build_cloud/windows_build_cloud.md

doc/ci/runners/index.md

doc/ci/runners/runner_cloud/linux_runner_cloud.md

doc/ci/runners/runner_cloud/macos/environment.md

doc/ci/runners/runner_cloud/macos_runner_cloud.md

doc/ci/runners/runner_cloud/windows_runner_cloud.md

doc/development/agent/gitops.md

doc/development/agent/identity.md

doc/development/agent/index.md

doc/development/agent/local.md

doc/development/agent/repository_overview.md

doc/development/agent/routing.md

doc/development/agent/user_stories.md

doc/development/internal_api.md