add fav icon for django admin

Author: civilcoder55

src/templates/admin/base_site.html

@@ -0,0 +1,6 @@
+{% extends "admin/base_site.html" %}
+{% load static %}
+{% block extrahead %}
+<link rel="icon"
+    href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>📦</text></svg>">
+{% endblock %}