Remove synapse helper scripts

They're not maintained, and actually highly advised against

ansible/roles/intersect-docker/files/synapse/docker-compose.yml

@@ -31,4 +31,3 @@ services:
       - POSTGRES_PASSWORD=synapse
     volumes:
       - ./postgresql:/var/lib/postgresql/data
-      - ./synapse_scripts:/opt/synapse_scripts:ro

ansible/roles/intersect-docker/tasks/synapse.yml

@@ -33,9 +33,3 @@
     chdir: /opt/synapse
     cmd: "{{ docker_update_command }}"
   when: compose_file.changed or homeserver_config.changed
-
-- name: Install helper scripts
-  git:
-    repo: https://github.com/xwiki-labs/synapse_scripts
-    dest: /opt/synapse/synapse_scripts
-    force: true