Drop the unused htpasswd file and the secret in the sms readme

Also rename the Outline env template to .env.j2 so it does not look like a dotenv file.

outline/roles/outline/tasks/main.yaml

@@ -14,7 +14,7 @@
 
 - name: Upload the .env file
   template:
-    src: "files/.env"
+    src: "files/.env.j2"
     dest: "/var/lib/{{ host_directory }}/.env"
 
 - name: Create Outline container