Show invited users (#297)

* Adds loadAll action to redux entity config

* API Client get invites

* Add invites to the user management page

* Updates user block styles on user management page

* Submit modal form on enter

* Modify details form styles

* Enter submits edit user form

* Removes unused admin dashboard page

* API Client - revoke invites

* Delete invite entities in redux

* Revoke invites from admin manage users page

* Show success flash message after user invite is revoked

frontend/components/FlashMessage/styles.js

@@ -14,6 +14,14 @@ export default {
       justifyContent: 'space-between',
       paddingLeft: padding.half,
       paddingRight: padding.half,
+      position: 'fixed',
+      left: '223px',
+      right: 0,
+      top: 0,
+      zIndex: '2',
+      '@media (max-width: 760px)': {
+        left: '54px',
+      },
     };
 
     if (alertType === 'success') {