Removes Feature Management Section (#105766)

Update _index.md

Feature Toggles page has been removed. 

Recommending to remove this from our docs

docs/sources/setup-grafana/configure-grafana/_index.md

@@ -2709,34 +2709,6 @@ Some feature toggles for stable features are on by default. Use this setting to
 
 <hr>
 
-### `[feature_management]`
-
-The options in this section configure the experimental Feature Toggle Admin Page feature, which is enabled using the `featureToggleAdminPage` feature toggle. Grafana Labs offers support on a best-effort basis, and breaking changes might occur prior to the feature being made generally available.
-
-For more information, refer to [Configure feature toggles](feature-toggles/).
-
-#### `allow_editing`
-
-Lets you switch the feature toggle state in the feature management page. The default is `false`.
-
-#### `update_webhook`
-
-Set the URL of the controller that manages the feature toggle updates. If not set, feature toggles in the feature management page are read-only.
-
-{{< admonition type="note" >}}
-The API for feature toggle updates has not been defined yet.
-{{< /admonition >}}
-
-#### `hidden_toggles`
-
-Hide additional specific feature toggles from the feature management page. By default, feature toggles in the `unknown`, `experimental`, and `private preview` stages are hidden from the UI. Use this option to hide toggles in the `public preview`, `general availability`, and `deprecated` stages.
-
-#### `read_only_toggles`
-
-Use to disable updates for additional specific feature toggles in the feature management page. By default, feature toggles can only be updated if they are in the `general availability` and `deprecated`stages. Use this option to disable updates for toggles in those stages.
-
-<hr>
-
 ### `[date_formats]`
 
 This section controls system-wide defaults for date formats used in time ranges, graphs, and date input boxes.