Revert moving breadcrumb punting to v10

Author: jonrohan

modules/primer-breadcrumb/index.scss

@@ -1,3 +1,4 @@
 // support files
 @import "primer-support/index.scss";
+@import "primer-marketing-support/index.scss";
 @import "./lib/breadcrumb.scss";

modules/primer-breadcrumb/package.json

@@ -8,7 +8,7 @@
   "style": "build/build.css",
   "main": "build/index.js",
   "primer": {
-    "category": "core",
+    "category": "marketing",
     "module_type": "components"
   },
   "files": [

modules/primer-core/index.scss

@@ -16,7 +16,6 @@
 // Core modules
 @import "primer-base/index.scss";
 @import "primer-box/index.scss";
-@import "primer-breadcrumb/index.scss";
 @import "primer-buttons/index.scss";
 @import "primer-table-object/index.scss";
 @import "primer-forms/index.scss";

modules/primer-core/package.json

@@ -27,7 +27,6 @@
   },
   "dependencies": {
     "primer-base": "1.5.0",
-    "primer-breadcrumb": "1.4.0",
     "primer-box": "2.5.0",
     "primer-buttons": "2.4.0",
     "primer-forms": "1.4.0",