Add remove_date to YAML front matter of redirect docs

doc/administration/auth/okta.md

doc/administration/geo/replication/remove_geo_node.md

doc/administration/geo/replication/using_a_geo_server.md

doc/administration/git_annex.md

doc/api/dora4_group_analytics.md

doc/ci/chatops/README.md

doc/ci/docker/README.md

.../examples/test-and-deploy-python-application-to-heroku.md

...ci/examples/test-and-deploy-ruby-application-to-heroku.md

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

doc/ci/quick_start/README.md

doc/ci/services/README.md

doc/ci/ssh_keys/README.md

...opment/documentation/site_architecture/release_process.md

doc/development/event_tracking/backend.md

doc/development/event_tracking/frontend.md

doc/development/event_tracking/index.md

doc/development/fe_guide/event_tracking.md

doc/development/feature_flags/development.md

doc/development/feature_flags/process.md