Add git + paste + calendar to the top menu.
Reorder some posts.

Two posts were written the same second (yeah, really, we do that), thus
the posts order was defined by the last modification date between both.
Let's set a one second timespan so they appear in the same order they
actually happened.
Don't underline top menu links, post titles, site title.
Styles pour l'affichage dynamique des posts.