Migrate the documentation to staging

[lubosmj]

closes #347

[pedro-psb]

The content placement looks good to me!

The === "Script" syntax is mostly usefull for when there is more than one tab, its a little odd to use it with only one tab. I recommend removing these and using simple codeblocks in those cases:

# Single tabbed
- == "Script"
-
-    ```bash
-    pulp ostree repository sync --name foo --remote bar
-
-    ```

# Simple codeblocks
+```bash
+pulp ostree repository sync --name foo --remote bar
+```