Add instructions for same-host mode

docs/server-side.md

@@ -0,0 +1,24 @@
+
+---
+title: Running abra on the server
+---
+
+## Why?
+
+If you're on an environment where it's hard to run Docker, or command-line programs in general, you might want to install `abra` on a server instead of your local computer.
+
+To install `abra` on a different server than you'll be hosting your apps, just follow [getting started guide](/overview/) as normal.
+
+If you want to install `abra` on the same server, there's one change.
+
+Instead of providing your SSH connection details when you run `abra server add ...`, just use `default`:
+
+```
+abra server add default
+```
+
+!!! note "Technical details"
+
+	This will tell `abra` to look at the Docker system running on the server, instead of a remote one.
+
+Make sure to back up your `~/abra/` directory on the server, or put it in version control, as well as other files you'd like to.

mkdocs.yml

@@ -50,6 +50,7 @@ nav:
       - Back-up and restore an app: backup-restore.md
       - Scale an app up to handle more traffic: scale.md
       - Roll an app back to a previous version: rollback.md
+      - Running abra on the server: server-side.md
   - Strategy: strategy.md
   - Bike map: bikemap.md
   - Troubleshooting: troubleshooting.md