[LGM] preps for LGM2020

[ale rimoldi]

hi

> In the meantime, I guess we can already replace last year's website
> with the current one, it is ready enough to at least announce the
> venue, dates and other useful info.

for the last week, i was waiting for elisa to show up in irc and ask if
the site is ready for being the default one...

now i have the answer to my question and 2020/ is now the default site.

ciao
a.l.e