Document how to try out the hacks.

docs/en/src/awesome-hacks.md

@@ -8,6 +8,13 @@ Do you have something cool to share?
 
 [Edit this file][3] or [share them here][4] or [let us know][5].
 
+You can try these hacks by writing them to a file, say `hack.lua` and passsing
+it to xplr with `--extra-config` or `-C`.
+
+```bash
+xplr -C hack.lua
+```
+
 ### cd on quit
 
 Change directory using xplr.