Document installation in production

docs/uwsgi_photos.ini

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+[uwsgi]
+# www-data can write media
+uid             = www-data
+gid             = www-data
+# Django-related settings
+# the base directory (full path)
+chdir           = /var/www/photos/photo21
+# the virtualenv (full path)
+home            = /var/www/photos/photo21/venv
+wsgi-file       = /var/www/photos/photo21/photo21/wsgi.py
+plugin          = python3
+# process-related settings
+master          = true
+# maximum number of worker processes
+processes       = 10
+# the socket (use the full path to be safe
+socket          = /var/www/photos/photos21/photos21.sock
+# ... with appropriate permissions - may be needed
+chmod-socket    = 664
+# clear environment on exit
+vacuum          = true