Allow to join an open group

Also:

* Refactor interacting with a remote event so that you can interact with
  a remote group as well
* Add a setting for group admins to pick between an open and invite-only
  group
* Fix new groups without posts/todos/resources/events/conversations URL
  set
* Repair local groups that haven't got their
  posts/todos/resources/events/conversations URL set
* Add a scheduled job to refresh remote groups every hour
* Add a user setting to pick when to receive notifications when there's
  new members to approve (will be used when this feature is available)
* Fix pagination for members

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/graphql/search.ts

@@ -78,3 +78,36 @@ export const SEARCH_PERSONS = gql`
     }
   }
 `;
+
+export const INTERACT = gql`
+  query Interact($uri: String!) {
+    interact(uri: $uri) {
+      ... on Event {
+        id
+        title
+        uuid
+        beginsOn
+        picture {
+          id
+          url
+        }
+        tags {
+          slug
+          title
+        }
+        __typename
+      }
+      ... on Group {
+        id
+        avatar {
+          id
+          url
+        }
+        domain
+        preferredUsername
+        name
+        __typename
+      }
+    }
+  }
+`;