Add missing charts documentation to global navigation

What does this MR do and why?

For: technical-writing#1042 (closed), make sure that charts documentation that should be on the global navigation is on the global navigation.

Pages now on navigation:

• https://eread-add-missing-charts-documentation-to-global-nav.docs.gitlab-review.app/charts/installation/verify_cng_images.html
• https://eread-add-missing-charts-documentation-to-global-nav.docs.gitlab-review.app/charts/advanced/external-db/external-omnibus-psql.html
• https://eread-add-missing-charts-documentation-to-global-nav.docs.gitlab-review.app/charts/advanced/external-gitaly/external-omnibus-gitaly.html
• https://eread-add-missing-charts-documentation-to-global-nav.docs.gitlab-review.app/charts/advanced/external-object-storage/minio.html
• https://eread-add-missing-charts-documentation-to-global-nav.docs.gitlab-review.app/charts/advanced/external-object-storage/gke-workload-identity.html
• https://eread-add-missing-charts-documentation-to-global-nav.docs.gitlab-review.app/charts/advanced/external-object-storage/azure-minio-gateway.html
• https://eread-add-missing-charts-documentation-to-global-nav.docs.gitlab-review.app/charts/advanced/external-object-storage/aws-iam-roles.html
• https://eread-add-missing-charts-documentation-to-global-nav.docs.gitlab-review.app/charts/advanced/external-redis/external-omnibus-redis.html

Merge request acceptance checklist

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