closes #12. add link to etherpad.

_includes/links.md

@@ -51,6 +51,7 @@
 [emblr-schedule]: https://docs.google.com/spreadsheets/d/1nVgPZG6thxJbJ8LgvTRwcwo2sjRMCvMy3bpuqUgWUWI/edit#gid=0)
 [epug]: https://bio-it.embl.de/embl-python-user-group/
 [epug-schedule]: https://docs.google.com/spreadsheets/d/1cMDumZ8GdhsTaiWzJl1qHDfi192sl4P1KJJhtuk0ZkE/edit
+[etherpad]: https://etherpad.org/
 [galaxy]: https://galaxyproject.org/
 [gbcs]: https://gbcs.embl.de/
 [gbcs-galaxy]: https://galaxy.embl.de/