Remove unused / unneeded options from settings

1. Remove CONF_DIR. It was left over when the files in the conf directory
   were moved up to the demo directory.

2. Remove the CACHES setting. It was left over then the code was first
   added. There's no caching implemented in the demo site.

3. Add debug-toolbar to the middleware. It got left out by mistake.

4. Correct the module path in the ROOT_URLCONF setting.

5. Remove demo/templates from "DIRS" in the Templates setting. It is
   already added to the search with "APP_DIRS" set to True.

demo/settings.py

@@ -7,8 +7,7 @@
 
 DEBUG = True
 
-CONF_DIR = os.path.dirname(os.path.abspath(__file__))
-DEMO_DIR = os.path.dirname(CONF_DIR)
+DEMO_DIR = os.path.dirname(os.path.abspath(__file__))
 ROOT_DIR = os.path.dirname(DEMO_DIR)
 
 SECRET_KEY = "+^%b!5_!ul7prtm_y0w_xluJg32aqna&+)&thhy3)jqr2g*0%s"
@@ -30,16 +29,17 @@
     "django.middleware.csrf.CsrfViewMiddleware",
     "django.contrib.auth.middleware.AuthenticationMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
+    "debug_toolbar.middleware.DebugToolbarMiddleware",
 ]
 
-ROOT_URLCONF = "demo.conf.urls"
+ROOT_URLCONF = "demo.urls"
 
 STATIC_URL = "/static/"
 
 TEMPLATES = [
     {
         "BACKEND": "django.template.backends.django.DjangoTemplates",
-        "DIRS": [os.path.join(DEMO_DIR, "templates")],
+        "DIRS": [],
         "APP_DIRS": True,
         "OPTIONS": {
             "context_processors": [
@@ -64,13 +64,6 @@
 
 DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
 
-CACHES = {
-    "default": {
-        "BACKEND": "django.core.cache.backends.locmem.LocMemCache",
-        "LOCATION": "site",
-    }
-}
-
 INTERNAL_IPS = [
     "127.0.0.1",
 ]
@@ -108,4 +101,3 @@
         },
     },
 }
-