Update CSS, to make sure what was matching this h1 before now
only applies to the first <a>, not to all the links of the menu.
Also increase the font size/weigth of this link to match the default
h1 style better.
Update everything (I may have forgotten a few details however)
Split installation documentation in many parts, and make it so that
you only read what you need to read.
Left menu to quickly go to another page.
Remove the i18n docs as it was outdated and it duplicated contribute.joinplu.me