Delete old redirect files

These files have been redirected for a long time.
There are no links to any of these docs anywhere
in the main GitLab projects

doc/install/kubernetes/gitlab_chart.md

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-redirect_to: 'https://docs.gitlab.com/charts/'
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-This document was moved to [another location](https://docs.gitlab.com/charts/).

doc/install/kubernetes/gitlab_omnibus.md

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-redirect_to: 'https://docs.gitlab.com/charts/'
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-
-This document was moved to [another location](https://docs.gitlab.com/charts/).

doc/install/kubernetes/gitlab_runner_chart.md

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-redirect_to: 'https://docs.gitlab.com/runner/install/kubernetes.html'
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-This document was moved to [another location](https://docs.gitlab.com/runner/install/kubernetes.html).

doc/install/kubernetes/index.md

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-redirect_to: 'https://docs.gitlab.com/charts/'
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-This document was moved to [another location](https://docs.gitlab.com/charts/).

doc/install/kubernetes/preparation/connect.md

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-redirect_to: 'https://docs.gitlab.com/charts/installation/cloud/'
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-This document was moved to [another location](https://docs.gitlab.com/charts/installation/cloud/).

doc/install/kubernetes/preparation/eks.md

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-redirect_to: 'https://docs.gitlab.com/charts/installation/cloud/eks.html'
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-This document was moved to [another location](https://docs.gitlab.com/charts/installation/cloud/eks.html).

doc/install/kubernetes/preparation/networking.md

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-redirect_to: 'https://docs.gitlab.com/charts/installation/deployment.html#networking-and-dns'
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-This document was moved to [another location](https://docs.gitlab.com/charts/installation/deployment.html#networking-and-dns).

doc/install/kubernetes/preparation/rbac.md

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-redirect_to: 'https://docs.gitlab.com/charts/installation/deployment.html#rbac'
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-This document was moved to [another location](https://docs.gitlab.com/charts/installation/deployment.html#rbac).

doc/install/kubernetes/preparation/tiller.md

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-redirect_to: 'https://docs.gitlab.com/charts/installation/tools.html'
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-This document was moved to [another location](https://docs.gitlab.com/charts/installation/tools.html).

doc/install/kubernetes/preparation/tools_installation.md

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-redirect_to: 'https://docs.gitlab.com/charts/installation/tools.html'
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-
-This document was moved to [another location](https://docs.gitlab.com/charts/installation/tools.html).