Avoid folder indexing about podsync HOT 2 OPEN

FWIW, I just dropped a blank index.html file in the data directory and that hid the directory listings. Doesn't help if you know the podcast id, but you could presumably do the same in each feed's directory.

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My setup is the following, restricted to HTTPS using a LetsEncrypt certificate managed and maintained automatically by certbot:

server {
	listen 80;
	server_name cast.example.com;
	
	location / {
		index index.rss;
		root /Volumes/Drobo/Multimedia/YouTube;
	}
}

Only considers delivering "index.rss" files, if present, as the "default page" for a requested bare folder. (E.g. subscribe to cast.example.com/Uploads_from_Test_User within Podcasts.app.) This results in a 404 at the root level; no automatic directory listing is produced by Nginx by default, and keeps podcast subscription links to the domain and singular level of directory for the channel/playlist. (Omitted autoindex directive.)

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