fix: send mjs as text/javascript

layouts/partials/body/scripts.html

@@ -1,5 +1,5 @@
 <script type="module">
-    import * as DarkModeToggle from '/static/js/darkmode.mjs';
+    import * as DarkModeToggle from '/static/js/darkmode.js';
 
     const toggle = document.querySelector('dark-mode-toggle');
     const body = document.body;

layouts/partials/head/custom.html

@@ -2,4 +2,4 @@
 <link rel="authorization_endpoint" href="https://indieauth.com/auth">
 <link rel="webmention" href="https://webmention.io/rohanverma.net/webmention" />
 <link rel="pingback" href="https://webmention.io/rohanverma.net/xmlrpc" />
-<script type="module" src="/static/js/darkmode.mjs"></script>  
+<script type="module" src="/static/js/darkmode.js"></script>