Use the index Tera template for the index GET route

src/main.rs

@@ -10,12 +10,15 @@ extern crate rocket_contrib;
 use rocket::Rocket;
 use rocket_contrib::Template;
 
+use std::collections::HashMap;
+
 mod list;
 mod static_files;
 
 #[get("/")]
-fn index() -> &'static str {
-    "Hello, world!"
+fn index() -> Template {
+    let context: HashMap<String, String> = HashMap::new();
+    Template::render("index", &context)
 }
 
 fn rocket() -> Rocket {