Remove obsolete Kustomize documentation (airbytehq#29641)

Author: malikdiarra

docs/deploying-airbyte/README.md

@@ -8,8 +8,7 @@
 - [On Azure VM Cloud Shell](on-azure-vm-cloud-shell.md)
 - [On Digital Ocean Droplet](on-digitalocean-droplet.md)
 - [On GCP.md](on-gcp-compute-engine.md)
-- [On Kubernetes](on-kubernetes.md)
-    - [Using Helm](on-kubernetes-via-helm.md)
+- [On Kubernetes](on-kubernetes-via-helm.md)
 - [On OCI VM](on-oci-vm.md)
 - [On Restack](on-restack.md)
 - [On Plural](on-plural.md)

docs/deploying-airbyte/on-kubernetes.md

@@ -119,7 +119,7 @@ Set to empty values, e.g. "" to disable basic auth. **Be sure to change these va
 
 #### Data Retention
 
-1. `TEMPORAL_HISTORY_RETENTION_IN_DAYS` - Define the retention period of the job history in Temporal, defaults to 30 days. When running in docker, 
+1. `TEMPORAL_HISTORY_RETENTION_IN_DAYS` - Define the retention period of the job history in Temporal, defaults to 30 days. When running in docker,
    this same value is applied to the log retention.
 
 ### Docker-Only
@@ -162,7 +162,7 @@ A job specific variable overwrites the default sync job variable defined above.
 
 Note that Airbyte does not support logging to separate Cloud Storage providers.
 
-Please see [here](https://docs.airbyte.com/deploying-airbyte/on-kubernetes#configure-logs) for more information on configuring Kubernetes logging.
+Please see [here](https://docs.airbyte.com/deploying-airbyte/on-kubernetes-via-helm#configure-logs) for more information on configuring Kubernetes logging.
 
 1. `GCS_LOG_BUCKET` - Define the GCS bucket to store logs.
 2. `S3_BUCKET` - Define the S3 bucket to store logs.

docs/operator-guides/configuring-airbyte.md

@@ -12,7 +12,7 @@ If you need help from our team for your upgrades, we offer premium support to ou
 
 Airbyte intelligently performs upgrades automatically based off of your version defined in your `.env` file and will handle data migration for you.
 
-If you are running [Airbyte on Kubernetes](../deploying-airbyte/on-kubernetes.md), you will need to use one of the two processes defined [here](#upgrading-on-k8s-0270-alpha-and-above) that differ based on your Airbyte version.
+If you are running [Airbyte on Kubernetes](../deploying-airbyte/on-kubernetes-via-helm.md), you will need to use one of the two processes defined [here](#upgrading-on-k8s-0270-alpha-and-above) that differ based on your Airbyte version.
 
 ## Mandatory Intermediate Upgrade
 

docs/operator-guides/upgrading-airbyte.md

@@ -331,11 +331,6 @@ const deployAirbyte = {
       label: "On Google (GCP)",
       id: "deploying-airbyte/on-gcp-compute-engine",
     },
-    {
-      type: "doc",
-      label: "On Kubernetes using Kustomize",
-      id: "deploying-airbyte/on-kubernetes",
-    },
     {
       type: "doc",
       label: "On Kubernetes using Helm",