Moved common JS and CSS to separate file.

templates/errors/master.twig

@@ -7,7 +7,7 @@
 {% block html_head %}
     <meta name="description" content="{{ error_blerb }}">
     <link href="/vendor/fontawesome/css/all.min.css" type="text/css" rel="stylesheet">
-    <link href="{{ asset('errors.css') }}" rel="stylesheet">
+    <link href="/errors.css" rel="stylesheet">
     <style>
         :root {
             --error-colour: {{ error_colour }};

templates/manage/users/ban.twig

@@ -51,10 +51,10 @@
 
     <script>
         window.addEventListener('load', function() {
-            const ubExpires = $i('ub_expires'),
-                ubExpiresCustom = $i('ub_expires_custom'),
-                ubSeverity = $i('ub_severity'),
-                ubSeverityDisplay = $i('ub_severity_display');
+            const ubExpires = $id('ub_expires'),
+                ubExpiresCustom = $id('ub_expires_custom'),
+                ubSeverity = $id('ub_severity'),
+                ubSeverityDisplay = $id('ub_severity_display');
 
             const updateExpires = function() {
                 ubExpiresCustom.parentNode.classList.toggle('manage__ban__duration__value__custom--hidden', ubExpires.value != '-2');

templates/master.twig

@@ -3,6 +3,7 @@
 {% block html_head %}
     {% include '_layout/meta.twig' %}
     <link href="/vendor/fontawesome/css/all.min.css" type="text/css" rel="stylesheet">
+    <link href="{{ asset('common.css') }}" type="text/css" rel="stylesheet">
     <link href="{{ asset('misuzu.css') }}" type="text/css" rel="stylesheet">
     {% if site_background is defined %}
         <style>
@@ -62,5 +63,6 @@
     {% endblock %}
 
     <script src="/vendor/highlightjs/highlight.min.js" type="text/javascript"></script>
+    <script src="{{ asset('common.js') }}" type="text/javascript"></script>
     <script src="{{ asset('misuzu.js') }}" type="text/javascript"></script>
 {% endblock %}

templates/oauth2/master.twig

@@ -3,6 +3,7 @@
 {% set html_title = (title is defined ? (title ~ ' :: ') : '') ~ globals.site_info.name %}
 
 {% block html_head %}
+    <link href="{{ asset('common.css') }}" rel="stylesheet">
     <link href="{{ asset('oauth2.css') }}" rel="stylesheet">
 {% endblock %}
 
@@ -35,5 +36,6 @@
             </div>
         </div>
     </div>
+    <script src="{{ asset('common.js') }}"></script>
     <script src="{{ asset('oauth2.js') }}"></script>
 {% endblock %}