allow handlebars sprig in content markdown files

Signed-off-by: Rajat Jindal <rajatjindal83@gmail.com>

src/content.rs

@@ -387,13 +387,16 @@ impl Content {
             // be rendered as HTML
             handlebars.register_escape_fn(handlebars::no_escape);
 
+            // register the handlebars_sprig helpers
+            handlebars_sprig::addhelpers(&mut handlebars);
+
             // run the markdown through the template engine to
             // enable any script helpers
             out = handlebars
                 .render_template(&self.body, &{})
                 .unwrap_or_else(|e| {
                     // print the error
-                    eprintln!("Error rendering markdown: {e}");
+                    eprintln!("Error rendering markdown: {:#?}", e);
                     // return nothing
                     e.to_string()
                 });