Add Philipps great 35c3 talk and Davids and Andreas fosdem talk to the conferences page. linuxboot adds those to their website too but they can't be linked to too often :) Change-Id: I1e7ce078020dc5e9c9d9d47210c70ee16ef2f82e Signed-off-by: Martin Kepplinger <martink@posteo.de> Reviewed-on: https://review.coreboot.org/c/31265 Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>