Update the vault passphrase, add notes to readme.

readme.org

@@ -6,7 +6,12 @@
    matrix.awful.club
    #+END_SRC
    - make sure you have the proper gpg key on your file system ( since we are using the "open the vault" method of protecting our passwords here)
+   - Make sure you've got the posix ansible collection installed: ~ansible-galaxy collection install ansible.posix~
 
 ** common scripts:
  ~ansible-playbook -i inventory/hosts matrix-docker-ansible-deploy/setup.yml --tags=setup-all,start~
    - this will upgrade your configured matrix things.
+
+** rekeying the gpg thing
+   - make sure you know the ansible vault password
+   -