rename packages directory to modules

modules/primer-core/package.json

@@ -1,5 +1,5 @@
 {
-  "version": "4.0.3",
+  "version": "5.0.0",
   "name": "primer-core",
   "description": "Primer CSS's core modules",
   "homepage": "http://primercss.io/",

modules/primer-css/package.json

@@ -1,5 +1,5 @@
 {
-  "version": "8.0.0",
+  "version": "8.0.0-rc",
   "name": "primer-css",
   "description": "Primer is the CSS framework that powers GitHub's front-end design. Primer-css includes 23 packages that are grouped into 3 core meta-packages for easy install. Each package and meta-package is independently versioned and distributed via npm, so it's easy to include all or part of Primer within your own project.",
   "homepage": "http://primercss.io/",
@@ -29,19 +29,19 @@
     "primer-breadcrumb": "^1.0.0",
     "primer-buttons": "^2.0.4",
     "primer-cards": "^0.1.6",
-    "primer-core": "^4.0.3",
+    "primer-core": "^5.0.0",
     "primer-forms": "^1.0.11",
     "primer-labels": "^1.1.4",
     "primer-layout": "^1.0.3",
     "primer-markdown": "^3.3.11",
-    "primer-marketing": "^4.0.3",
+    "primer-marketing": "^5.0.0",
     "primer-marketing-support": "^1.0.0",
     "primer-marketing-type": "^1.0.0",
     "primer-marketing-utilities": "^1.0.0",
     "primer-navigation": "^1.0.4",
     "primer-page-headers": "^1.0.0",
     "primer-page-sections": "^1.0.0",
-    "primer-product": "^4.0.3",
+    "primer-product": "^5.0.0",
     "primer-support": "^4.0.5",
     "primer-table-object": "^1.0.7",
     "primer-tables": "^1.0.0",