I rewrote the webapp list template. I changed the style completely using
bootstrap cards.
I added two specific template filters. One is dedicated to extract the
first and last name of the contact email (can be done because inria and
irisa email have coherent naming pattern). The other filter is to
prettify some apps names such as replacing underscores by spaces.

I removed as well the momentjs library call (that was commented) and use
the Django builtin library called `humanize` that display that has a
filter to display nice dates used in the template (such as relative
dates).

Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>