add part function

src/main.rs

@@ -1,6 +1,9 @@
 use std::{fs, path::Path};
 
+use part::Parts;
+
 mod law;
+mod part;
 
 fn main() {
     fs::create_dir_all("./output").unwrap();
@@ -15,6 +18,7 @@ fn main() {
 fn create_index(content: &str) {
     let mut index = fs::read_to_string("templates/index.html").unwrap();
     index = index.replace("{{content}}", content);
+    let index = Parts::new().perform(index);
     fs::write("output/index.html", &index).expect("Unable to write file");
 }