Page.RSSLink is deprecated warning

[mfherman]

Thanks for the great theme! I just upgraded to Hugo 0.68 and I started getting this warning:

WARN 2020/05/17 20:10:03 Page.RSSLink is deprecated and will be removed in a future release. Use the Output Format's link, e.g. something like: 
    {{ with .OutputFormats.Get "RSS" }}{{ .RelPermalink }}{{ end }}

Tried to modify the RSS components in the theme but didn't have any luck! Any thoughts?

[alexpghayes]

See #132