Fingerprint CSS file and use method aliases.

Fingerprinting a static file ensures that when the content changes, the browser
cache is invalidated (because the filename changes). Otherwise a return visitor
may not see the latest changes to the site.
https://gohugo.io/hugo-pipes/fingerprint/

I also switched to using the method aliases instead of specifying the full path
to resources:
* toCSS => resources.ToCSS
* minify => resources.Minify
* fingerprint => resources.Fingerprint
https://gohugo.io/hugo-pipes/introduction/#method-aliases

Recall that I don't need to explicitly call minify, because I pass "compressed"
to toCSS, which is supposed to be better at minifying the CSS file.
https://gohugo.io/hugo-pipes/scss-sass/

Author: jdblischak

layouts/partials/head.html

@@ -5,7 +5,7 @@
 <!-- <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/css/bulma.min.css"> -->
 {{ $sass := resources.Get "sass/main.scss" }}
 {{ $options := (dict "targetPath" "css/main.css" "outputStyle" "compressed" ) }}
-{{ $style := $sass | resources.ToCSS $options }}
+{{ $style := $sass | toCSS $options | fingerprint }}
 <link rel="stylesheet" href="{{ $style.RelPermalink }}">
 <link rel="stylesheet" href="/css/fontawesome.min.css">
 <link rel="stylesheet" href="/css/brands.min.css">