Explain who we are, what we do, what are our values.
The explanation is a deck of cards, with an horizontal scrollbar
to navigate between them.
We use Sly (with bugfixes for non list items).
As a follow-up commit, calls for actions and links to the relevant
resources will be interesting.
Eglide logo is by @rama.
Cards follow the colors defined in M11.
Ref. T1148