Update links to wiki pages (migration to Github)

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Update Network URL to network repository

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Merge branch 'master' into new_kontalk.org

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>

Conflicts:
	kontalk.org/index.html