[todo] check items that are deemed "done"

TODO.md

@@ -3,8 +3,8 @@ title: Things that ought to be done
 description: Todo items in lists, and lists themselves, are not prioritised
 ---
 
-- [ ] write first playbook
-  - [ ] install postgres on "database_servers"
+- [x] write first playbook
+  - [x] install postgres on "database_servers"
     - [ ] become "postgres", not root
     - [ ] create db schema and user for the django project
   - [ ] install some django project via git on "application_servers"
@@ -14,7 +14,7 @@ description: Todo items in lists, and lists themselves, are not prioritised
     - [ ] `./manage.py check` should pass as well
   - [ ] make playbook available via "just deploy"
 
-- [ ] add just targets for testing/linting
+- [x] add just targets for testing/linting
 
 - [ ] make just use "dry run" by default