Remove ancient geo redirects

As part of docs site improvements, we can now
delete these

doc/gitlab-geo/after_setup.md

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-redirect_to: '../administration/geo/replication/using_a_geo_server.md'
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-This document was moved to [another location](../administration/geo/replication/using_a_geo_server.md).

doc/gitlab-geo/bring-primary-back.md

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-redirect_to: '../administration/geo/disaster_recovery/bring_primary_back.md'
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-This document was moved to [another location](../administration/geo/disaster_recovery/bring_primary_back.md).

doc/gitlab-geo/configuration.md

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-redirect_to: '../administration/geo/replication/configuration.md'
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-This document was moved to [another location](../administration/geo/replication/configuration.md).

doc/gitlab-geo/configuration_source.md

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-redirect_to: '../administration/geo/replication/configuration.md'
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-This document was moved to [another location](../administration/geo/replication/configuration.md).

doc/gitlab-geo/database.md

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-redirect_to: '../administration/geo/setup/database.md'
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-This document was moved to [another location](../administration/geo/setup/database.md).

doc/gitlab-geo/database_source.md

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-redirect_to: '../administration/geo/setup/database.md'
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-This document was moved to [another location](../administration/geo/setup/database.md).

doc/gitlab-geo/disaster-recovery.md

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-redirect_to: '../administration/geo/disaster_recovery/index.md'
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-This document was moved to [another location](../administration/geo/disaster_recovery/index.md).

doc/gitlab-geo/docker_registry.md

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-redirect_to: '../administration/geo/replication/docker_registry.md'
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-This document was moved to [another location](../administration/geo/replication/docker_registry.md).

doc/gitlab-geo/faq.md

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-redirect_to: '../administration/geo/replication/faq.md'
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-This document was moved to [another location](../administration/geo/replication/faq.md).

doc/gitlab-geo/ha.md

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-redirect_to: '../administration/geo/replication/multiple_servers.md'
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-This document was moved to [another location](../administration/geo/replication/multiple_servers.md).

doc/gitlab-geo/object_storage.md

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-redirect_to: '../administration/geo/replication/object_storage.md'
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-This document was moved to [another location](../administration/geo/replication/object_storage.md).

doc/gitlab-geo/planned-failover.md

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-redirect_to: '../administration/geo/disaster_recovery/planned_failover.md'
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-This document was moved to [another location](../administration/geo/disaster_recovery/planned_failover.md).

doc/gitlab-geo/security-review.md

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-redirect_to: '../administration/geo/replication/security_review.md'
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-This document was moved to [another location](../administration/geo/replication/security_review.md).

doc/gitlab-geo/ssh.md

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-redirect_to: '../administration/operations/fast_ssh_key_lookup.md'
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-This document was moved to [another location](../administration/operations/fast_ssh_key_lookup.md).

doc/gitlab-geo/troubleshooting.md

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-redirect_to: '../administration/geo/replication/troubleshooting.md'
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-This document was moved to [another location](../administration/geo/replication/troubleshooting.md).

doc/gitlab-geo/tuning.md

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-redirect_to: '../administration/geo/replication/tuning.md'
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-This document was moved to [another location](../administration/geo/replication/tuning.md).

doc/gitlab-geo/updating_the_geo_nodes.md

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-redirect_to: '../administration/geo/replication/updating_the_geo_nodes.md'
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-This document was moved to [another location](../administration/geo/replication/updating_the_geo_nodes.md).

doc/gitlab-geo/using_a_geo_server.md

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-redirect_to: '../administration/geo/replication/using_a_geo_server.md'
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-This document was moved to [another location](../administration/geo/replication/using_a_geo_server.md).