css: add icons utility

Adds an .icon utility class to set ligature text via via a data-icon
attribute on the element. This is a workaround to prevent crawlers from
picking up the font ligature innertext in html directly.

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

assets/css/icons.css

@@ -0,0 +1,19 @@
+@layer utilities {
+  .icon {
+    font-family: "Material Symbols Rounded";
+    font-weight: normal;
+    font-style: normal;
+    font-size: 24px; /* Preferred icon size */
+    display: inline-block;
+    line-height: 1;
+    text-transform: none;
+    letter-spacing: normal;
+    word-wrap: normal;
+    white-space: nowrap;
+    direction: ltr;
+  }
+
+  .icon:after {
+    content: attr(data-icon);
+  }
+}

assets/css/styles.css

@@ -14,3 +14,4 @@
 @import "tailwindcss/utilities";
 @import "/assets/css/syntax-light";
 @import "/assets/css/syntax-dark";
+@import "/assets/css/icons";