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/import/import.styl

@@ -1,17 +1,47 @@
 @import 'nib'
 
 .map-members
-  .mapping:first-of-type
-    border-top: solid 1px #999
-  .mapping
-    padding: 10px 0
-    border-bottom: solid 1px #999
-    .source
+  &:after
+    content: "";
+    flex: auto;
+
+  .mapping-list
+    display: flex
+    flex-wrap: wrap
+    margin: 0 -4px
+
+    .mapping-item
+      max-width: 300px
+      min-width: 200px
+      padding: 6px
+      margin: 5px
+      flex:1
+      background: white
+      border-radius: 3px
+      box-shadow: 0 1px 2px rgba(0,0,0,.15)
+
+      &:hover
+        background: darken(white, 5%)
+
+      &.filled
+        background: #E0FFE5
+
+        &:hover
+          background: #FFE0E0
+
+      &.ghost-item
+        height: 0
+        visibility: hidden
+        border: none
+
+    .profile-source
       display: inline-block
       width: 80%
+
     .wekan
       display: inline-block
       width: 35px
+
       .member
         float: none