feature: new page to display info about a circle and add members

- New styles for "add users" drodown
- New custom widget to display members
- Use of the permission system

src/templates/hd-circle-team.pug

@@ -0,0 +1,16 @@
+include hd-user-avatar.pug
+
+sib-widget(name='team-template')
+  template
+    sib-display(
+      data-src="${await value}"
+      fields='account.picture, sup(name, groups), sub(profile.city)'
+
+      widget-account.picture='hd-user-avatar'
+      widget-groups='hd-user-groups'
+
+      multiple-groups=''
+    )
+
+sib-widget(name='hd-user-groups')
+  template ${await value.name}

src/templates/template-team.pug

@@ -21,3 +21,4 @@ sib-widget(name='team-template')
       data-src="${value.user ? value.user['@id'] : ''}"
       fields='username'
     )
+