Cleanup: Remove all references to deleted SCM plugins documentation

Removed all links to /developer/scm-plugins.md following the deletion of
that documentation file (feature is problematic and shouldn't be encouraged
for customization).

**Changes:**

**docs/developer/index.md:**
- Removed SCM Plugins from overview list
- Removed entire "Source Control Integration" section

**docs/developer/java-plugin-development.md:**
- Removed "Source Control" section with ScmExportPlugin and ScmImportPlugin

**docs/developer/plugin-properties.md:**
- Removed tip box referencing SCM Plugins localization

**docs/manual/projects/scm/index.md:**
- Removed developer link (user manual page kept intact)

**docs/.vuepress/config.ts:**
- Redirected old /developer/10-scm-plugins.html URL to manual SCM page
  instead of the deleted developer page

All references to the deleted SCM plugins developer documentation have been
removed while preserving the user manual documentation for the existing feature.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: fdevans

docs/.vuepress/config.ts

@@ -166,7 +166,7 @@ export default defineUserConfig({
           '/developer/07-storage-plugin.html': '/developer/storage-plugins.html',
           '/developer/08-storage-converter-plugins.html': '/developer/storage-converter-plugins.html',
           '/developer/09-orchestrator-plugin.html': '/developer/orchestrator-plugins.html',
-          '/developer/10-scm-plugins.html': '/developer/scm-plugins.html',
+          '/developer/10-scm-plugins.html': '/manual/projects/scm/index.html',
           '/developer/11-ui-plugins.html': '/developer/ui-plugins.html',
           '/developer/12-option-values-plugins.html': '/developer/option-values-plugins.html',
           '/developer/13-user-group-source-plugin.html': '/developer/user-group-source-plugins.html',

docs/developer/index.md

@@ -13,7 +13,6 @@ Rundeck plugins allow you to extend Rundeck's functionality by adding new capabi
 - [Notifications](/developer/notification-plugins.md) - Send notifications on job events
 - [Log Filters](/developer/log-filter-plugins.md) - Transform or capture log output
 - [Storage Plugins](/developer/storage-plugins.md) - Store key/password data in external systems
-- [SCM Plugins](/developer/scm-plugins.md) - Integrate with source control systems
 - [And many more...](#available-plugin-types)
 
 ## Choosing Your Plugin Development Approach
@@ -199,10 +198,6 @@ Rundeck supports many different types of plugins. Each type serves a specific pu
 - **[Execution Lifecycle Plugins](/developer/execution-lifecycle.md)** - Hook into execution lifecycle events
 - **[Job Lifecycle Plugins](/developer/job-lifecycle.md)** - Hook into job definition lifecycle
 
-### Source Control Integration
-
-- **[SCM Plugins](/developer/scm-plugins.md)** - Integrate jobs with Git or other SCM systems
-
 ### User Interface
 
 - **[UI Plugins](/developer/ui-plugins.md)** - Add custom UI components

docs/developer/java-plugin-development.md

@@ -290,11 +290,6 @@ Java plugins can implement any of these services:
 
 - **[Orchestrator](/developer/orchestrator-plugins.md)** - Control node execution order
 
-### Source Control
-
-- **[ScmExportPlugin](/developer/scm-plugins.md)** - Export jobs to SCM
-- **[ScmImportPlugin](/developer/scm-plugins.md)** - Import jobs from SCM
-
 ### Configuration
 
 - **[PluginGroup](/developer/plugin-groups.md)** - Define shared properties

docs/developer/plugin-properties.md

@@ -304,10 +304,6 @@ The `messages.properties` file is a [Java Properties Format](https://docs.oracle
 | `property.NAME.description` | Description for configuration property named "NAME" |
 | `property.NAME.defaultValue` | Static text/html for a STATIC_TEXT property named "NAME" |
 
-::: tip
-SCM Plugins have additional message codes. See: [SCM Plugins - Localization](/developer/scm-plugins.md#localization)
-:::
-
 ### Message Code Resolution
 
 The message code will be resolved using the following search pattern using the Service and Provider names:

docs/manual/projects/scm/index.md

@@ -7,8 +7,6 @@ which can be configured to perform Import or Export behaviors, or both.
 
 Rundeck includes a Git plugin for SCM management of Jobs.
 
-To develop a SCM Plugin, see [Plugin Developer Guide - SCM Plugins](/developer/scm-plugins.md).
-
 Project SCM can be configured in the GUI, or via the [API](/api/index.md#scm).
 
 In the GUI: