Switching to Workbench lesson infrastructure

v4.0

Update authors list, prepare for v4.0

First release published from the Carpentries Incubator

v3.1

Update URLs

Lambrecht2019

Up to date README.md

That was a really outdated first README made in 2015.
Is is now reflects the reality. Also, replaced some
relic FIXMEs by actual URLs.

aachen2018

v2.0

Version of GAP to 4.9.3

First release of the GAP SWC lesson

v1.0

Merge branch 'gh-pages' of github.com:swcarpentry/styles into gh-pages