cv: misc updates
fab: include command for PDF generation
cv: regenerate PDF with the appropriate fonts
fab: add a command to generate screenshots with cutycapt

This is for testing purposes.
css: rework input search box
css: subtle changes to background and menu bar
layout: remove the sidebar and move its content below title

The sidebar is difficult to notice and to use. Just put the
appropriate links below the title. The vertical rythme is broken and
we lose the social networks. We will add them later.
layout: also put links to PDF and other lang in CV
layout: add back social media icons
article: fix footnote in ExaBGP article
css: redo search box again to work better accross browsers

Vertical centering is hell.
tags: change "networking" to "network"
fab: provide description to `push*` commands