Use solid/filled Font Awesome icons for consistency.

Some of the "open" icons are not in the free FA tier, so rather than mix
the two we should use solid icons everywhere.

static/icons/info.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" fill-rule="evenodd" clip-rule="evenodd" stroke-linejoin="round" stroke-miterlimit="1.414"><path d="M8 0c4.411 0 8 3.589 8 8s-3.589 8-8 8-8-3.589-8-8 3.589-8 8-8zm0 14c3.309 0 6-2.691 6-6s-2.691-6-6-6-6 2.691-6 6 2.691 6 6 6zm0-8c.552 0 1 .447 1 1v4.436c0 .552-.448 1-1 1s-1-.448-1-1V7c0-.553.448-1 1-1zm0-3c.26 0 .52.11.71.29.18.19.29.45.29.71 0 .271-.11.521-.29.71-.38.37-1.05.37-1.42 0C7.11 4.521 7 4.26 7 4c0-.26.11-.52.29-.71.19-.18.45-.29.71-.29z" fill-rule="nonzero"/></svg>
+<svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="info-circle" class="svg-inline--fa fa-info-circle fa-w-16" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M256 8C119.043 8 8 119.083 8 256c0 136.997 111.043 248 248 248s248-111.003 248-248C504 119.083 392.957 8 256 8zm0 110c23.196 0 42 18.804 42 42s-18.804 42-42 42-42-18.804-42-42 18.804-42 42-42zm56 254c0 6.627-5.373 12-12 12h-88c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h12v-64h-12c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h64c6.627 0 12 5.373 12 12v100h12c6.627 0 12 5.373 12 12v24z"></path></svg>