feat: invites (#967)

* stub invite endpoint

* feat: First pass invite UI

* feat: allow removing invite rows

* First pass: sending logic

* fix: label accessibility

* fix: add button submits
incorrect permissions
middleware flow error

* 💚

* Error handling, email filtering, tests

* Flow

* Add Invite to people page
Remove old Tip

* Add copy link to subdomain

server/models/Collection.js

@@ -239,7 +239,6 @@ Collection.prototype.updateDocument = async function(
     this.documentStructure = updateChildren(this.documentStructure);
     await this.save({ transaction });
     await transaction.commit();
-
   } catch (err) {
     if (transaction) {
       await transaction.rollback();
@@ -296,7 +295,6 @@ Collection.prototype.removeDocumentInStructure = async function(
       transaction,
     });
     await transaction.commit();
-
   } catch (err) {
     if (transaction) {
       await transaction.rollback();