Syncscroll now uses `data-name` instead of just `name`.
Also, breadcrumb the way with Gherkin.

Hopefully.

(while solving another goulish git merge)

The local backoffice of Grav can be used to craft courses.
This is inspiring!

We'd need 3D for this, or way too much javascript.

Let's be explicit about the state of development!

Basically, you can do anything with this website, as long as you're open-source too.

The route is `/lesson/<lesson-slug>`.
The level parameter is not yet taken into account.
The language is not yet taken into account either.

Babel fishes are awesome.
Using flags for languages is somewhat offensive,
since it's a gross, unfair simplification.
We'll remove the flags later.

We still need a proper flag for the rosetta stone.

This reverts commit 203dc39a for the README.

Perhaps we'll customize this further when I'll be inspired.

Implements #4

Also introduce a translations file for our "textbook" theme.

It is now submitted.

It's okay, PR is on the way.

(now I need to give it its own repository)
(and to translate it into french)