Adding migration instructions.

README.md

@@ -8,11 +8,11 @@ To run this ansible playbook, you need to:
 
 - Have a server / VPS where lemmy will run.
 - Configure a DNS `A` Record to point at your server's IP address.
-- Make sure you can ssh to it: `ssh my_user@domain.tld`
+- Make sure you can ssh to it: `ssh <your-user>@<your-domain>`
 - Install [Ansible](https://www.ansible.com/) on your local machine.
 
 
-## Deploy steps
+## Install
 
 Clone lemmy-docker-ansible-deploy: 
 
@@ -44,3 +44,15 @@ Run the playbook:
 If the command above fails, you may need to comment out this line In the ansible.cfg file:
 
 `interpreter_python=/usr/bin/python3`
+
+## Migrating your existing install to use this deploy
+
+- Back up your existing docker folder.
+- Run `docker-compose stop` to stop lemmy.
+- Move your docker folders on the server to `<lemmy_base_dir>/<your-domain>`.
+- Copy your postgres password to `passwords/<your-user>@<your-domain>/postgres`.
+- Follow the install guide above, making sure your `config.hjson` is the same as your backup.
+
+## Uninstall
+
+`ansible-playbook -i inventory/hosts uninstall.yml --become`