docker env vars, selenium docker simplified, favicon, settings clean

app_urls/fetcher/middleware/favicon.py

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+from django.utils.deprecation import MiddlewareMixin
+
+'''
+class FaviconMiddleware(MiddlewareMixin):
+    def process_response(self, request, response):
+        if 'text/html' in response.get('Content-Type', '') and b'</head>' in response.content:
+            icon_link = b'<link rel="icon" type="image/png" href="/static/img/mate-icon.png">\n'
+            response.content = response.content.replace(b'</head>', icon_link + b'</head>')
+        return response
+'''
+
+class FaviconMiddleware(MiddlewareMixin):
+    def process_response(self, request, response):
+        if 'text/html' in response.get('Content-Type', '') and b'</head>' in response.content:
+            icon_link = (
+                b"<link rel='icon' href=\"data:image/svg+xml,"
+                b"<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 120'>"
+                b"<text y='96' font-size='96'>\xf0\x9f\xa7\x89</text></svg>\">"
+                b"\n"
+            )
+            # (UTF-8 encoded 🧉 = \xf0\x9f\xa7\x89 in bytes)
+            response.content = response.content.replace(b'</head>', icon_link + b'</head>')
+        return response