Switch to using webhook_bridge instead of lighthouse for triggering the CI.

src/lib.rs

@@ -1,7 +1,6 @@
 #![feature(exit_status_error)]
 #![feature(trait_alias)]
 #![feature(path_file_prefix)]
-#![feature(is_sorted)]
 #![feature(test)]
 #![feature(iter_intersperse)]
 #![feature(exact_size_is_empty)]

src/types/document.rs

@@ -47,6 +47,7 @@ pub struct Section<'s> {
 }
 
 #[derive(Debug)]
+#[allow(clippy::large_enum_variant)]
 pub enum DocumentElement<'s> {
     Heading(Heading<'s>),
     Section(Section<'s>),