chore: move favicon markup to core assets

In assets_custom, it was copied by CMS in Core-CMS-Custom and tup-ui.

Stop copying. No one ever changes it. Settings do that. Let Core lead.

taccsite_cms/templates/assets_core.html

@@ -8,3 +8,7 @@
   @import url("https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css") layer(foundation);
   @import url("{% static 'site_cms/css/build/core-styles.base.css' %}") layer(base);
 </style>
+
+{% with settings.FAVICON as favicon %}
+<link rel="icon" href="{% static favicon.img_file_src %}" type="image/x-icon" />
+{% endwith %}

taccsite_cms/templates/assets_custom.html

@@ -1,5 +1,3 @@
-{% load static %}
-
 {# Load assets as external files, to cache independently of markup. #}
 {% comment %}
 FAQ: IF a script or style is better cached with markup, THEN:
@@ -11,13 +9,6 @@
 
 
 
-<!-- Custom Site Assets: Favicon. -->
-{% with settings.FAVICON as favicon %}
-<link rel="icon" href="{% static favicon.img_file_src %}" type="image/x-icon" />
-{% endwith %}
-
-
-
 {# Do NOT directly load project-specific assets here; see `/taccsite_custom` #}
 
 {# Example #}