Use new aliases for template functions

`page.rs.html` used to result in a function `templates::page`.
Since ructe 0.7.2, `templates::page_html` was used and now the old alias
has been removed.

templates/index.rs.html

@@ -1,9 +1,9 @@
-@use super::base;
+@use super::base_html;
 @use crate::statics::VersionInfo;
 
 @(version_info: VersionInfo, repo_count: usize, base_url: &str)
 
-@:base("Hits-of-Code Badges", "Hits-of-Code Badges", {
+@:base_html("Hits-of-Code Badges", "Hits-of-Code Badges", {
 
 <p>
 This API offers badges for the Hits-of-Code metric for your repositories. This metric was proposed by