[css][xs]: fix hr css (against new light background).
[contact][xs]: link to irc webchat option.
[members/signup][s]: reference signing up to the mailing list.
[members][xs]: oldest members first ;-).
[layouts][xs]: remove unneeded fonts (obsoleted by recent upgrade).
[#26,join][l]: fully operational join / get involved page - fixes #26.

* link from nav menu