Change the board import layout from a popup to a full page

This commit also removes the “import a single Trello card” as we couldn’t figure
out some reasonable use case.

We also create a new publication on the server to provide the minimal user
profile informations required to display an avatar.

config/router.js

@@ -79,6 +79,26 @@ FlowRouter.route('/shortcuts', {
   },
 });
 
+FlowRouter.route('/import', {
+  name: 'import',
+  triggersEnter: [
+    AccountsTemplates.ensureSignedIn,
+    () => {
+      Session.set('currentBoard', null);
+      Session.set('currentCard', null);
+
+      Filter.reset();
+      EscapeActions.executeAll();
+    },
+  ],
+  action() {
+    BlazeLayout.render('defaultLayout', {
+      headerBar: 'importHeaderBar',
+      content: 'import',
+    });
+  },
+});
+
 FlowRouter.notFound = {
   action() {
     BlazeLayout.render('defaultLayout', { content: 'notFound' });