make it possible to link to # fragments in [page:meow] links, like [page:meow#purrrr]

src/config.rs

@@ -151,9 +151,15 @@ impl Config {
     }
 
     pub fn page_url(&self, page: &str) -> String {
+        let (page, hash) = page.split_once('#').unwrap_or((page, ""));
+
         // We don't want .dj appearing in URLs, though it exists as a disambiguator in [page:] links.
         let page = page.strip_suffix(".dj").unwrap_or(page);
-        format!("{}/{}", self.site, page)
+        if !hash.is_empty() {
+            format!("{}/{page}#{hash}", self.site)
+        } else {
+            format!("{}/{page}", self.site)
+        }
     }
 
     pub fn pic_url(&self, pics_dir: &dyn Dir, id: &str) -> String {