Add frontend JS and improve post styling

Frontend is built with Bun. It uses Stimulus to progressively enhance
the server-built HTML. Currently, it only replaces UTC timestamps from
the server with the time in the browser's timezone.

src/partials/layout.rs

@@ -6,6 +6,7 @@ use axum::{
 };
 use maud::{html, Markup, DOCTYPE};
 
+use crate::JS_BUNDLES;
 use crate::config::Config;
 use crate::partials::header::header;
 
@@ -42,6 +43,9 @@ impl Layout {
                     script type="module" {
                         r#"import * as Turbo from 'https://cdn.skypack.dev/@hotwired/turbo';"#
                     }
+                    @for js_bundle in JS_BUNDLES.lines() {
+                        script type="module" src=(js_bundle) {}
+                    }
                     link rel="stylesheet" href="/static/styles.css";
                 }
                 body {