New structure of the wiki start page

Has issue type	Suggestion
Has author	dominique.weber
Has responsible person or organization	Christian Rosset
Has issue description	New structure of the wiki start page
Has issue solution	Linking the most important content and user manuals
Has issue priority	"medium" is not in the list of possible values (1-high, 2-medium, 3-low) for this property.
Has task status