move embarkjs packages & remove embark- prefix from some folders (#1879)

* chore(@embark/): move embarkjs packages to their own folder

* chore(@embark/): rename embark-ui folder to cockpit

* chore(@embark/): rename packages already in logical folders to remove embark- prefix

chore(@embark/): rename packages already in logical folders to remove embark- prefix

update package.json files to use correct eslint config

remove core/* from package.json workspaces

package.json

@@ -78,8 +78,8 @@
       "packages/core/*",
       "packages/plugins/*",
       "packages/stack/*",
-      "packages/*",
-      "core/*"
+      "packages/embarkjs/*",
+      "packages/*"
     ],
     "nohoist": [
       "embark/embark-test-contract-0",