mastodon: added advanced web interface+welcome tuto

	images/interface_avancee1.png
	images/interface_avancee2.png
3 jobs for dev in 56 seconds
Status Job ID Name Coverage
  Assets
passed #6673
node

00:00:16

 
  Pages
passed #6674
pages

00:00:40

 
  Deploy
failed pages:deploy

00:00:00