Options:
1) Within your code editor, search for “.RSSLink” and “.Hugo”
2) With Linux/macOS use grep:
grep -r "\.RSSLink"
themes/hyde/layouts/partials/head.html: <link href="{{ .RSSLink }}" rel="alternate" type="application/rss+xml" title="{{ .Site.Title }}" />
layouts/partials/head.html: <link href="{{ .RSSLink }}" rel="alternate" type="application/rss+xml" title="{{ .Site.Title }}" />
grep -r "\.Hugo"
themes/hyde/layouts/partials/head.html: {{ .Hugo.Generator }}
layouts/partials/head.html: {{ .Hugo.Generator }}