fix for duplicate files being created.

.env.example

@@ -4,8 +4,17 @@ DJANGO_DEBUG = False
 
 DJANGO_ALLOWED_HOSTS = 'localhost'
 
-# pip install psycopg2-binary
-DATABASE_URL = 'postgres://{user}:{password}@{hostname}:{port}/{database-name}'
+DB_USER=admin
+DB_PASS=password
+DB_HOST=database
+DB_DATABASE=cbwebreader
+
+# https://github.com/jacobian/dj-database-url
+DATABASE_URL = 'postgres://${DB_USER}:${DB_PASS}@${DB_HOST}/${DB_DATABASE}'
+
+COMIC_BOOK_VOLUME = '/path/to/comic/folder'
+
+STATIC_ROOT = '/static'
 
 # This expects the office winrar unrar command line tool for windows or linux.
 # Will work without setting if it is in the path