chore: move files in components to match standard

packages/components/Login/package.json

@@ -2,7 +2,7 @@
   "name": "pubsweet-component-login",
   "version": "2.1.1",
   "description": "Basic login component for PubSweet",
-  "main": "index.js",
+  "main": "src/index.js",
   "author": "Collaborative Knowledge Foundation",
   "license": "MIT",
   "dependencies": {

packages/components/Login/index.js → packages/components/Login/src/index.js

-import Login from './src/LoginContainer'
+import Login from './LoginContainer'
 
 export default Login

packages/components/Signup/package.json

@@ -2,14 +2,14 @@
   "name": "pubsweet-component-signup",
   "version": "1.0.41",
   "description": "Basic signup form component for PubSweet",
-  "main": "index.js",
+  "main": "src/index.js",
   "author": "Collaborative Knowledge Foundation",
   "license": "MIT",
   "dependencies": {
     "@pubsweet/ui": "^9.1.3",
     "@pubsweet/ui-toolkit": "2.0.7",
     "formik": "^1.3.0",
-    "prop-types": "^15.5.10", 
+    "prop-types": "^15.5.10",
     "recompose": "^0.26.0"
   },
   "peerDependencies": {

packages/components/Signup/index.js → packages/components/Signup/src/index.js

-import Signup from './src/SignupContainer'
+import Signup from './SignupContainer'
 
 export default Signup

packages/components/SortableList/package.json

 {
   "name": "pubsweet-component-sortable-list",
   "version": "0.1.13",
-  "main": "src",
+  "main": "src/",
   "license": "MIT",
   "dependencies": {
     "react-dnd": "^2.5.4",