Tidy icon noise, URL strings, and null guards

src/components/TextLink.astro

@@ -28,7 +28,7 @@ const linkIsExternal: boolean =
   {...attrs}
   ><span class="group-hover:text-primary-600"><slot /></span>{
     includeExternalLinkIcon && linkIsExternal && (
-      <sup class="ml-0.5 inline-block">
+      <sup class="ml-0.5 inline-block" aria-hidden="true">
         <Icon
           name="mdi:external-link"
           class:list={[