fix: anchor links

fixes https://github.com/tidalcycles/strudel/issues/432
+ fix style regression in mini repl

website/src/docs/docs.css

@@ -10,27 +10,33 @@
   height: 70px;
   visibility: hidden;
   pointer-events: none;
-  position: relative;
 }
 
-.prose h1:hover .icon-link,
-.prose h2:hover .icon-link,
-.prose h3:hover .icon-link,
-.prose h4:hover .icon-link,
-.prose h5:hover .icon-link,
-.prose h6:hover .icon-link,
-.icon.icon-link:hover {
+.icon.icon-link {
+  visibility: hidden;
+}
+
+.prose h1:hover .icon.icon-link,
+.prose h2:hover .icon.icon-link,
+.prose h3:hover .icon.icon-link,
+.prose h4:hover .icon.icon-link,
+.prose h5:hover .icon.icon-link,
+.prose h6:hover .icon.icon-link {
   visibility: visible;
 }
-.icon.icon-link {
-  background-image: url(./link.svg);
-  background-repeat: no-repeat;
-  width: 16px;
-  height: 16px;
-  display: block;
-  position: absolute;
-  visibility: hidden;
-  margin-left: -20px;
-  width: 20px;
-  margin-top: 8px;
+
+.prose h1 > a,
+.prose h2 > a,
+.prose h3 > a,
+.prose h4 > a,
+.prose h5 > a,
+.prose h6 > a {
+  text-decoration: none !important;
+}
+
+.icon.icon-link::after {
+  content: '#';
+  margin-left: 8px;
+  font-size: 0.9em;
+  opacity: 50%;
 }