Edit collection (#173)

* Collection edit modal

* Add icon

* 💚

* Oh look, some specs

* Delete collection

* Remove from collection

* Handle error responses
Protect against deleting last collection

* Fix key

* 💚

* Keyboard navigate documents list

* Add missing database constraints

server/models/Collection.js

@@ -74,6 +74,7 @@ Collection.associate = models => {
   Collection.hasMany(models.Document, {
     as: 'documents',
     foreignKey: 'atlasId',
+    onDelete: 'cascade',
   });
   Collection.belongsTo(models.Team, {
     as: 'team',