Improve schema infobox

[enridaga]

As the summary says

[raphaelfournier]

Commit b2f2bb8 removes the empty key-values pairs.

Need to do:

• order of displayed keys should specified (by us, probably in an external file)

[raphaelfournier]

Preliminary idea: add a "toggle button", for allowing to remove it from the page.

[raphaelfournier]

Fixed in v1.1