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.

client/components/main/layouts.styl

@@ -26,13 +26,14 @@ body
 #content
   position: relative
   flex: 1
-  overflow: hidden
+  overflow-x: hidden
 
   .sk-spinner
     margin-top: 30vh
 
   > .wrapper
-    margin-top: 25px
+    margin-top: 10px
+    padding: 15px
 
 #modal
   position: absolute
@@ -109,6 +110,9 @@ a
     cursor: default
     text-decoration: none
 
+span a
+  text-decoration: underline
+
 strong
   font-weight: bold