Add Gradle plugin repository setup instructions to docs

Updated documentation to include instructions for configuring pluginManagement repositories in settings.gradle.kts when using the KTale Gradle plugin. This helps users resolve the plugin from the correct repositories.

Author: CoasterFreakDE

docs/getting-started.mdx

@@ -18,6 +18,21 @@ dependencies {
 }
 ```
 
+## Gradle plugin repositories (if using `cc.modlabs.ktale-deps`)
+
+If you use the KTale Gradle plugin (`cc.modlabs.ktale-deps`), ensure your build can resolve it:
+
+```kotlin
+// settings.gradle.kts
+pluginManagement {
+  repositories {
+    gradlePluginPortal()
+    maven("https://nexus.modlabs.cc/repository/maven-public/")
+    mavenLocal()
+  }
+}
+```
+
 ## Your first plugin
 
 KTale plugin entrypoint is `ktale.api.KtalePlugin`:

docs/gradle-plugin.mdx

@@ -10,6 +10,23 @@ KTale includes a Gradle plugin that writes dependency manifests into your jar so
 
 ## Usage (Gradle Kotlin DSL)
 
+### Resolve the plugin
+
+Add the ModLabs repo to `pluginManagement`:
+
+```kotlin
+// settings.gradle.kts
+pluginManagement {
+  repositories {
+    gradlePluginPortal()
+    maven("https://nexus.modlabs.cc/repository/maven-public/")
+    mavenLocal()
+  }
+}
+```
+
+### Configure `ktaleDeps`
+
 ```kotlin
 plugins {
   id("cc.modlabs.ktale-deps")

docs/plugin-developer-workflow.mdx

@@ -40,6 +40,19 @@ dependencies {
 
 If you want a clean, unshaded jar and let the standalone host download deps:
 
+#### Resolve the Gradle plugin
+
+```kotlin
+// settings.gradle.kts
+pluginManagement {
+  repositories {
+    gradlePluginPortal()
+    maven("https://nexus.modlabs.cc/repository/maven-public/")
+    mavenLocal()
+  }
+}
+```
+
 ```kotlin
 plugins {
   id("cc.modlabs.ktale-deps")