Use favicon instead of logo in wagtail admin (#650)

Starting with 4.0, sites with navbar settings disabled do not have the
ability to change the light/dark setting, which was being used in the
admin to put a light or dark background on the logo. Determining if the
logo is light or dark is a perpetual problem here. Because if this, the
default was light background, and a white logo is now unreadable.

To simplify it, let's switch to using the favicon. The favicon is much
more suitable for this kind of situation.

coderedcms/static/coderedcms/css/crx-admin.css

@@ -27,21 +27,13 @@ textarea.monospace,
 .crx-logo-custom {
   width: auto;
   height: auto;
-  max-height: 80px;
   max-width: 100%;
   display: block;
 }
-.crx-logo-container {
-  box-sizing: border-box;
-  margin: 0 15px;
-}
-.crx-logo-container.navbar-light {
-  background-color: #fff;
-  border-radius: 6px;
-  padding: 0.25em;
-}
-.crx-logo-container.navbar-dark {
-  background-color: transparent;
+
+.sidebar-custom-branding {
+  padding: 20px;
+  margin: 0;
 }
 
 

coderedcms/templates/wagtailadmin/base.html

@@ -1,6 +1,5 @@
 {% extends "wagtailadmin/base.html" %}
 {% load coderedcms_tags wagtailimages_tags wagtailsettings_tags %}
-{% django_setting "CRX_DISABLE_LAYOUT" as disable_layout %}
 
 {% block furniture %}
     {% include "coderedcms/includes/crx_banner.html" %}
@@ -9,4 +8,4 @@
 
 {# NOTE: this must be on a single line, otherwise Django templates will create
   whitespace, and wagtail will think the whitespace is the custom logo! #}
-{% block branding_logo %}{% if not disable_layout and settings.coderedcms.LayoutSettings.logo %}<div class="crx-logo-container {{settings.coderedcms.LayoutSettings.navbar_color_scheme}}">{% image settings.coderedcms.LayoutSettings.logo original format-webp preserve-svg as logo_image %}<img src="{{ logo_image.url }}" class="crx-logo-custom" alt="Dashboard"></div>{% endif %}{% endblock %}
+{% block branding_logo %}{% django_setting "CRX_DISABLE_LAYOUT" as disable_layout %}{% if not disable_layout and settings.coderedcms.LayoutSettings.favicon %}{% image settings.coderedcms.LayoutSettings.favicon original format-webp preserve-svg as logo_image %}<img src="{{ logo_image.url }}" class="crx-logo-custom" alt="Dashboard">{% endif %}{% endblock %}