Update to feed-related config keys.

[masroof-maindak]

Hi, thanks for the amazing theme, it's everything I've ever wanted from Hugo for a LONG while; one tiny thing I had to adjust to get it to work however was adding an s to instances of feed-related keys, namely generate_feed to generate_feeds and feed_filename to feed_filenames in config.toml as well as content/blog/_index.md. Additionally, the value of feed_filenames needs to be encased within an array.

Just thought I'd let you know in case you weren't aware.

[isunjn]

Thanks, this is due to a breaking change of zola v0.19.0 (#2477), fixed in v4.0.0