Trier ce qui devrait aller upstream et ce qui devrait sortir de git

Signed-off-by: Genevieve Bastien <gbastien@versatic.net>

Romain Dessort a rédigé il y a 8 ans et Geneviève Bastien a validé il y a 8 ans

There is a weird bug reported by Claude: the X-WR-CALDESC value switch randomly
between "L'Agenda du libre du Québec" and "L'Agenda du libre", even if
there is no modification done into the ics feed. This makes calendar clients
consider all events as new ones.
The correct value is "L'Agenda du libre du Québec", which is definied into yaml config file.

This replaces the "application" directory where were stored some common static pages

A separate filter page lets users search more precisely for events or organisations, in different formats

Event calendar better displayed on small screens: past events only visible when hovering over the current month

as recommended in RFC 3986 section C (ftp://ftp.rfc-editor.org/in-notes/rfc3986.txt)

Close #77

The parameter that can be used to have future *and* past events in the rss feed is renamed to `future`

RSS feeds can be easily parsed and hence can be used to populate program for
events with the proper tags. By adding the 'showall=true' to the query string,
it is possible to see all events corresponding to the requested criteria in
the RSS feed, whether past or future and more than 20.

Signed-off-by: Geneviève Bastien <gbastien@versatic.net>