option to set theme to dark by default by customizing application_config.js, independent of browser/system theme

www/common/boot2.js

@@ -1,17 +1,31 @@
-(function () {
-try {
+define([
+    '/common/requireconfig.js', 
+    '/customize/application_config.js'
+], function (RequireConfig, AppConfig) {
+
+    var checkDefaultDarkTheme = function () {
+        if (AppConfig.defaultDarkTheme) {
+            return os = 'dark';
+        } else {
             var isDarkOS = function () {
                 try {
                     return window.matchMedia('(prefers-color-scheme: dark)').matches;
                 } catch (e) { return false; }
             };
+            return os = isDarkOS() ? 'dark' : 'light';
+        }
+    }; 
+
+    var os = checkDefaultDarkTheme()
+    
+    try {
         var flush = window.CryptPad_flushCache = function () {
             Object.keys(localStorage).forEach(function (k) {
                 if (k.indexOf('CRYPTPAD_CACHE|') !== 0 && k.indexOf('LESS_CACHE') !== 0) { return; }
                 delete localStorage[k];
             });
         };
-    var os = isDarkOS() ? 'dark' : 'light';
+
         var key = 'CRYPTPAD_STORE|colortheme';
         window.CryptPad_theme = localStorage[key] || os;
         if (!localStorage[key]) {
@@ -27,14 +41,11 @@ try {
             s.innerHTML = 'body { background: black; }';
             document.body.appendChild(s);
         }
-} catch (e) { console.error(e); }
-})();
+    } catch (e) { console.error(e); }
 
-// This is stage 1, it can be changed but you must bump the version of the project.
-define([
-    '/common/requireconfig.js'
-], function (RequireConfig) {
 
+
+    // This is stage 1, it can be changed but you must bump the version of the project.
     require.config(RequireConfig());
 
     // most of CryptPad breaks if you don't support isArray