feat(sidebars): allow webgl-extension-method to show up in ApiRef sidebar (#195)

* feat(templ): allow webgl-extension-method to show up in ApiRef sidebar

Author: Josh-Cena

crates/rari-doc/src/sidebars/apiref.rs

@@ -73,6 +73,7 @@ pub fn sidebar(slug: &str, group: Option<&str>, locale: Locale) -> Result<MetaSi
             PageType::WebApiInstanceMethod => &mut instance_methods,
             PageType::WebApiConstructor => &mut constructors,
             PageType::WebApiEvent => &mut events,
+            PageType::WebglExtensionMethod => &mut instance_methods,
             _ => continue,
         };
         v.push(page);