fix: In page anchor links not working on shared docs

closes #2652

app/utils/urls.js

@@ -20,6 +20,27 @@ export function isInternalUrl(href: string) {
   return false;
 }
 
+export function isHash(href: string) {
+  if (href[0] === "#") return true;
+
+  try {
+    const outline = new URL(window.location.href);
+    const parsed = new URL(href);
+
+    if (
+      outline.hostname === parsed.hostname &&
+      outline.pathname === parsed.pathname &&
+      !!parsed.hash
+    ) {
+      return true;
+    }
+  } catch (e) {
+    // failed to parse as url
+  }
+
+  return false;
+}
+
 export function decodeURIComponentSafe(text: string) {
   return text
     ? decodeURIComponent(text.replace(/%(?![0-9][0-9a-fA-F]+)/g, "%25"))