Greatly reduce generated HTML page size

Author: GuillaumeGomez

rinja.toml

@@ -1,2 +1,3 @@
 [general]
 dirs = ["util/gh-pages/"]
+whitespace = "suppress"

tests/compile-test.rs

@@ -394,7 +394,7 @@ struct Renderer<'a> {
 lints:&'aVec<LintMetadata>,
 }
 
-impl<'a>Renderer<'a>{
+implRenderer<'_>{
 fnmarkdown(input:&str) -> Safe<String>{
 let parser = Parser::new_ext(input,Options::all());
 letmut html_output = String::new();