routes: fix internal link detection

it just checked link length, but should at least ensure that the
condition which checks for internal links starts with a slash.

src/main.ts

@@ -317,7 +317,7 @@ const handleLink = (a: HTMLAnchorElement, e: MouseEvent) => {
     || href.startsWith('/feed')
     || href.startsWith('/note')
     || href.startsWith('/npub')
-    || href.length === 65
+    || (href.startsWith('/') && href.length === 65)
   ) {
     route(href);
     history.pushState({}, '', href);