Use Hugo's built-in subresource integrity support

We can use Hugo's built-in SRI support instead of using our custom
SRI generator script (as cool as it was at the time). This is more
clean and gives us the added benefit of adding fingerprints to the
CSS and JS filenames, which acts as a cache buster.

See: https://gohugo.io/hugo-pipes/introduction/
See: https://github.com/alanorth/hugo-theme-bootstrap4-blog/issues/120

layouts/_default/baseof.html

@@ -14,10 +14,12 @@
 
     {{ if or (eq .Lang "ar") (eq .Lang "fa") }}
     {{ "<!-- ar -->" | safeHTML }}
-    <link href="{{ "css/style.rtl.css" | absURL }}" rel="stylesheet"{{ if not .Site.Params.disable_sri }} integrity="{{ .Site.Data.sri.styleltr}}" crossorigin="anonymous"{{ end }}>
+    {{ $styleRtl := resources.Get "css/style.rtl.css" | resources.Fingerprint }}
+    <link href="{{ $styleRtl.Permalink }}" rel="stylesheet"{{ if not .Site.Params.disable_sri }} integrity="{{ $styleRtl.Data.Integrity }}" crossorigin="anonymous"{{ end }}>
     {{ else }}
     {{ "<!-- combined, minified CSS -->" | safeHTML }}
-    <link href="{{ "css/style.css" | absURL }}" rel="stylesheet"{{ if not .Site.Params.disable_sri }} integrity="{{ .Site.Data.sri.style}}" crossorigin="anonymous"{{ end }}>
+    {{ $style := resources.Get "css/style.css" | resources.Fingerprint }}
+    <link href="{{ $style.Permalink }}" rel="stylesheet"{{ if not .Site.Params.disable_sri }} integrity="{{ $style.Data.Integrity }}" crossorigin="anonymous"{{ end }}>
     {{ end }}
 
     {{ "<!-- RSS 2.0 feed -->" | safeHTML }}

layouts/partials/cookie-consent.html

@@ -1,5 +1,7 @@
-<link href="{{ "css/cookieconsent.min.css" | absURL }}" rel="stylesheet" type="text/css"{{ if not .Site.Params.disable_sri }} integrity="{{ .Site.Data.sri.cookieconsentcss }}" crossorigin="anonymous"{{ end }}>
-<script src="{{ "js/cookieconsent.min.js" |absURL }}"{{ if not .Site.Params.disable_sri }} integrity="{{ .Site.Data.sri.cookieconsentjs }}" crossorigin="anonymous"{{ end }} async></script>
+{{ $cookieConsentStyle := resources.Get "css/cookieconsent.min.css" | resources.Fingerprint }}
+<link href="{{ $cookieConsentStyle.Permalink }}" rel="stylesheet" type="text/css"{{ if not .Site.Params.disable_sri }} integrity="{{ $cookieConsentStyle.Data.Integrity }}" crossorigin="anonymous"{{ end }}>
+{{ $cookieConsentScript := resources.Get "js/cookieconsent.min.js" | resources.Fingerprint }}
+<script src="{{ $cookieConsentScript.Permalink }}"{{ if not .Site.Params.disable_sri }} integrity="{{ $cookieConsentScript.Data.Integrity }}" crossorigin="anonymous"{{ end }} async></script>
 
 <script>
 window.addEventListener("load", function(){

package.json

@@ -7,13 +7,13 @@
     "url": "https://github.com/alanorth/hugo-theme-bootstrap4-blog.git"
   },
   "scripts": {
-    "build:css": "node-sass --output-style expanded --precision 6 source/scss/style.scss static/css/style.css.tmp && cleancss --level 1 static/css/style.css.tmp -o static/css/style.css",
-    "build:ltrcss": "rtlcss -s static/css/style.css.tmp static/css/style.rtl.css.tmp && cleancss --level 1 static/css/style.rtl.css.tmp -o static/css/style.rtl.css",
+    "build:css": "node-sass --output-style expanded --precision 6 source/scss/style.scss assets/css/style.css.tmp && cleancss --level 1 assets/css/style.css.tmp -o assets/css/style.css",
+    "build:ltrcss": "rtlcss -s assets/css/style.css.tmp assets/css/style.rtl.css.tmp && cleancss --level 1 assets/css/style.rtl.css.tmp -o assets/css/style.rtl.css",
     "build:fonts": "cp node_modules/font-awesome/fonts/* static/fonts",
-    "build:cookieconsent": "cp node_modules/cookieconsent/build/cookieconsent.min.css static/css && cp node_modules/cookieconsent/build/cookieconsent.min.js static/js",
+    "build:cookieconsent": "cp node_modules/cookieconsent/build/cookieconsent.min.css assets/css && cp node_modules/cookieconsent/build/cookieconsent.min.js assets/js",
     "build:generatesri": "node build/sri.js > data/sri.toml",
     "build": "npm run build:css && npm run build:ltrcss && npm run build:fonts && npm run build:cookieconsent && npm run build:generatesri && npm run clean",
-    "clean": "rm static/css/style.css.tmp static/css/style.rtl.css.tmp"
+    "clean": "rm assets/css/style.css.tmp assets/css/style.rtl.css.tmp"
   },
   "keywords": "hugo",
   "author": "Alan Orth",