refactor(core): remove outline plugin and layout atom (#5326)

@affine/outline is no longer used, this PR deletes this plugin and deletes the code that is no longer used

yarn.lock

@@ -464,7 +464,6 @@ __metadata:
     "@affine/hello-world-plugin": "workspace:*"
     "@affine/image-preview-plugin": "workspace:*"
     "@affine/native": "workspace:*"
-    "@affine/outline-plugin": "workspace:*"
     "@affine/sdk": "workspace:*"
     "@affine/templates": "workspace:*"
     "@affine/vue-hello-world-plugin": "workspace:*"
@@ -675,20 +674,6 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@affine/outline-plugin@workspace:*, @affine/outline-plugin@workspace:packages/plugins/outline":
-  version: 0.0.0-use.local
-  resolution: "@affine/outline-plugin@workspace:packages/plugins/outline"
-  dependencies:
-    "@affine/component": "workspace:*"
-    "@affine/plugin-cli": "workspace:*"
-    "@affine/sdk": "workspace:*"
-    "@blocksuite/icons": "npm:2.1.36"
-    jotai: "npm:^2.5.1"
-    react: "npm:18.2.0"
-    react-dom: "npm:18.2.0"
-  languageName: unknown
-  linkType: soft
-
 "@affine/plugin-cli@workspace:*, @affine/plugin-cli@workspace:tools/plugin-cli":
   version: 0.0.0-use.local
   resolution: "@affine/plugin-cli@workspace:tools/plugin-cli"