news: refactor the news generation

Put the news in a vector, and convert that to html later. This is in
preparation for providing an RSS feed, so that we have a common source
for the events.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Add a simple RSS generator

This fixes #12, by adding a /news.rss file.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>