FSPT-119: remove custom scss/ css process

We don't take advantage of any of the features of the SCSS pre-processor
so lets remove it and add it back in if we need it.

This is the only use of the `pyscss` filter/ dependency in authenticator.

frontend/magic_links/templates/invalid.html

@@ -4,21 +4,16 @@
 {% set pageHeading %}{% trans %}Link expired{% endtrans %}{% endset %}
 {% block content %}
   <div>
-      {# TODO: Figure out translation for Link expired #}
       <h1 class="govuk-heading-xl">{{ pageHeading }}</h1>
   </div>
 <div class="govuk-error-summary" aria-labelledby="error-summary-title" role="alert" data-module="govuk-error-summary">
   <h2 class="govuk-error-summary__title" id="error-summary-title">
-      {# TODO: Figure out which should be used. #}
-      {# This link has expired #}
       {% trans %} Magic link expired {% endtrans %}
   </h2>
   <div class="govuk-error-summary__body">
       <ul class="govuk-list govuk-error-summary__list">
       <li>
-        {# TODO: Figure out which should be used. #}
-        {# <p class="fsd-error-message">To access your application, you need to request a new link. The link will work for 24 hours.</p> #}
-        <p class="fsd-error-message">{% trans %} You can request a new magic link to access your application. {% endtrans %}</p>
+        <p class="govuk-!-font-weight-bold">{% trans %} You can request a new magic link to access your application. {% endtrans %}</p>
       </li>
     </ul>
   </div>

frontend/templates/head.html

@@ -3,7 +3,6 @@
 <meta name="author" content="{{ service_meta_author }}">
 <!--[if gt IE 8]><!--><link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='govuk-frontend/govuk-frontend-4.0.0.min.css') }}" /><!--<![endif]-->
 <!--[if IE 8]><link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='govuk-frontend/govuk-frontend-ie8-4.0.0.min.css') }}" /><![endif]-->
-<!--[if gt IE 8]><!--><link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='css/main.min.css') }}" /><!--<![endif]-->
 {% assets "main_js" %}
     <script nonce="{{ csp_nonce() }}" type="text/javascript" src="{{ ASSET_URL }}" defer></script>
 {% endassets %}

static_assets.py

@@ -29,17 +29,9 @@ def init_assets(app=None, auto_build=False, static_folder="frontend/static/dist"
             output="js/main.min.js",
         )
 
-        css = Bundle(
-            "./scss/*.scss",
-            filters="pyscss,cssmin",
-            output="css/main.min.css",
-            extra={"rel": "stylesheet/css"},
-        )
-
-        env.register("default_styles", css)
         env.register("main_js", js)
 
-        bundles = [css, js]
+        bundles = [js]
         return bundles