Both @anthraxx and @jelle has agreed on IRC.

This adds a "date" to every page, which fixes the item order in the feed
and the "pubDate" is also correct now (before it was 01 Jan 0001). This
also avoids the "weight" variable, which was used to ensure the correct
order in the menu, as they are now sorted by the date.

The dates are pulled from the mails to a-d-p.

Fix #1