Document that we don't apply the idea plugin automatically anymore (#182)

Author: Technici4n

BREAKING_CHANGES.md

@@ -35,4 +35,5 @@ Nonetheless, every single breaking change is documented here, along with a sugge
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 - The `neoFormRuntime` property on the `neoForge` extension has been moved to the top-level. This should only affect advanced users. This was done in an effort to make the NFRT-specific tasks in MDG more reusable by projects not making use of a generic mod development environment. The `additionalResults` property moved to `neoForge.additionalMinecraftArtifacts` since it is more sensible to apply this only to MDGs `createMinecraftArtifacts` task rather than all NFRT tasks including user-created ones.
   - To fix, move your NFRT settings block to the project, and move `additionalResults` to `additionalMinecraftArtifacts` in the `neoForge` extension.
-  
+- The `idea` plugin is only applied when syncing with IntelliJ.
+  - If you want to use the `idea {  }` block in your build script, add the `idea` plugin explicitly.