Add icons

[kimicol]

Options are currently only in plain text, makking the web page a little bit empty. Also, because it does not catch the eyes, I didn't see the option "youtube" first which I though I should add an issue.

Adding few clickable icons next to these plain text commands would improve visibility of options, and improve global aspect of the page.

I suggest the following icons :

• A magnifying glass for the research
• Youtube logo for youtube
• A web logo (the globe like here : https://duckduckgo.com/?t=ffab&q=logo+web&iax=images&ia=images) or musicainfo's logo for infomusic
• A file logo for Documents
• A dowload logo for "téléchargement" (like an downward arrow)
• An eye for "voir en ligne"