major UI/UX improvements

Signed-off-by: ari melody <ari@arimelody.me>

public/script/header.js

@@ -0,0 +1,14 @@
+const header_links = document.getElementById("header-links");
+const hamburger = document.getElementById("header-links-toggle");
+
+function toggle_header_links() {
+        header_links.classList.toggle("open");
+}
+
+document.addEventListener("click", event => {
+        if (!header_links.contains(event.target) && !hamburger.contains(event.target)) {
+                header_links.classList.remove("open");
+        }
+});
+
+hamburger.addEventListener("click", event => { toggle_header_links(); });