Auto merge of #89695 - jsha:more-templates, r=GuillaumeGomez

Move top part of print_item to Tera templates

Part of #84419.

This moves the first line of each item page (E.g. `Struct foo::Bar .... 1.0.0 [-][src]` into a Tera template.

I also moved template initialization into its own module and added a small macro to reduce duplication and opportunity for errors.

src/librustdoc/html/render/mod.rs

@@ -31,6 +31,7 @@ mod tests;
 mod context;
 mod print_item;
 mod span_map;
+mod templates;
 mod write_shared;
 
 crate use context::*;