xP: convert links to link elements

xP/public/xP.css

@@ -86,19 +86,19 @@ body {
 	padding: .1rem .3rem;
 	white-space: pre-wrap;
 }
-.content span.b {
+.content .b {
 	font-weight: bold;
 }
-.content span.i {
+.content .i {
 	font-style: italic;
 }
-.content span.u {
+.content .u {
 	text-decoration: underline;
 }
-.content span.s {
+.content .s {
 	text-decoration: line-through;
 }
-.content span.m {
+.content .m {
 	font-family: monospace;
 }