Make external link styling site-wide

assets/scss/base.scss

@@ -34,9 +34,20 @@ article {
   h1, h2, h3 {
     margin-bottom: 1rem;
   }
+}
 
-  main {
-    /* Select all links that are external. */
+/*
+Select all links that are external.
+
+In this case, we'll just exclude all links that are...
+
+- All internal anchors.
+- All links that points to a relative path.
+- All origin-relative URLs.
+
+Also, all links that are explicitly marked as external are obviously
+considered.
+*/
 a[href]:not(:where(
   a[href^="#"],
   a[href^="./"],
@@ -48,9 +59,6 @@ article {
   content: " [🡕]";
   vertical-align: super;
 }
-  }
-}
-
 
 /* Text formatting */
 h1, h2, h3,
@@ -230,6 +238,12 @@ aside {
   width: 100%;
 }
 
+header, footer {
+  a[href]::after {
+    content: unset;
+  }
+}
+
 footer {
   align-items: center;
   display: flex;