replacing Whisperback by WhisperBack
Rename contribute into .mdwn
Convert /contribute to markdown
Change 'amnesiac' for 'amnesia'
Merge branch 'doc/contribute-categories'
updated PO files
Remove the blueprint for the contribute section
New blueprint for the contribute links
Fix markup.
updated PO files
Add promote/slides index page.

Else, the link to promote/slides on contribute/how/promote is broken..
Merge branch 'master' of ssh://webmasters.boum.org/~/wiki
Add blog post asking for UEFI hardware.
updated PO files
Minor tweak to force a page refresh.
Minor translation fixes.
Enable stable-proposed-updates APT sources.
Setup APT pinning to install packages from stable-proposed-updates.
Merge branch 'devel' into bugfix/safer-persistence
Minor rephrasing.