Replace feather by lucide

[smuteau]

Replace Feather webfont by Lucide webfont to get more icons and keep an up-to-date webfont library.

[smuteau]

Need fine tuning, wait for review.

[smuteau]

Here are the adjustments :

• added, to put icons at the right vertical position :

[class^="icon-"], [class*=" icon-"] {
  vertical-align: -0.125em;
}

• added, to get a better position of text and value (on the right of the icon) :

[class^="icon-"]::before,
[class*=" icon-"]::before {
  display: inline-block;
}

[smuteau]

Replaced by #5