Tidy up metadata, headings, forms, and small accessibility fixes

src/components/TextLink.astro

@@ -26,13 +26,13 @@ const linkIsExternal: boolean =
   target={href?.toString().startsWith("http") ? "_blank" : undefined}
   rel={linkIsExternal ? "noopener noreferrer" : undefined}
   {...attrs}
-  ><span class="group-hover:text-primary-100"><slot /></span>{
+  ><span class="group-hover:text-primary-600"><slot /></span>{
     includeExternalLinkIcon && linkIsExternal && (
       <sup class="ml-0.5 inline-block">
         <Icon
           name="mdi:external-link"
           class:list={[
-            "text-primary group-hover:text-primary-100 m-0 inline-block"
+            "text-primary group-hover:text-primary-600 m-0 inline-block"
           ]}
         />
       </sup>