[release-1.6] RHIDP-6571 - remove configuring the base URL for Operator-based (#1120)

Co-authored-by: Priyanka Abel <[email protected]>
Co-authored-by: Lindsey Frazier <[email protected]>
Co-authored-by: Fabrice Flore-Thébault <[email protected]>
Fixes https://issues.redhat.com/browse/RHIDP-6670

Author: openshift-cherrypick-robot

modules/configuring/proc-provisioning-your-custom-configuration.adoc

@@ -20,8 +20,14 @@ It contains one secret per line in `KEY=value` form.
 
 . Author your custom `{my-app-config-file}` file.
 This is the main {product-short} configuration file.
-+
-The `baseUrl` field is mandatory in your `{my-app-config-file}` file to ensure proper functionality of {product-short}. You must specify the `baseUrl` in both the `app` and `backend` sections to avoid errors during initialization.
+You need a custom `{my-app-config-file}` file to avoid the {product-short} installer to revert user edits during upgrades.
+When your custom `{my-app-config-file}` file is empty, {product-short} is using default values.
+
+** To prepare a deployment with the {product} Operator on {ocp-short}, you can start with an empty file.
+
+** To prepare a deployment with the {product} Helm chart, or on Kubernetes, enter the {product-short} base URL in the relevant fields in your `{my-app-config-file}` file to ensure proper functionality of {product-short}.
+The base URL is what a {product-short} user sees in their browser when accessing {product-short}.
+The relevant fields are `baseUrl` in the `app` and `backend` sections, and `origin` in the `backend.cors` subsection:
 +
 .Configuring the `baseUrl` in `{my-app-config-file}`
 ====
@@ -43,13 +49,13 @@ backend:
     origin: {my-product-url}
 ----
 ====
-+
-Optionally, enter your configuration such as:
 
-* link:{authentication-book-url}[{authentication-book-title}].
-* link:{authorization-book-url}[{authorization-book-title}].
-* link:{customizing-book-url}[Customization].
-* xref:proc-configuring-an-rhdh-instance-with-tls-in-kubernetes_running-behind-a-proxy[Configure your {ocp-short} integration].
+** Optionally, enter your configuration such as:
+
+*** link:{authentication-book-url}[{authentication-book-title}].
+*** link:{authorization-book-url}[{authorization-book-title}].
+*** link:{customizing-book-url}[Customization].
+*** xref:proc-configuring-an-rhdh-instance-with-tls-in-kubernetes_running-behind-a-proxy[Configure your {ocp-short} integration].
 
 . Provision your custom configuration files to your {ocp-short} cluster.