Make use of Hugo's 0.56+ module feature.

config.yml

@@ -26,6 +26,13 @@ layoutDir:              "site/layouts"
 staticDir:              "site/static"
 themesDir:              "site/themes"
 
+module:
+  hugoVersion:
+    min: 0.56.0
+  mounts:
+    - source:           "dist"
+      target:           "site/static/docs/4.3/dist"
+
 params:
   description:          "The most popular HTML, CSS, and JS library in the world."
   authors:              "Mark Otto, Jacob Thornton, and Bootstrap contributors"

package.json

@@ -20,12 +20,11 @@
   "scripts": {
     "start": "npm-run-all --parallel watch docs-serve",
     "bundlesize": "bundlesize",
-    "css": "npm-run-all css-compile css-prefix css-minify css-copy",
-    "css-copy": "cross-env-shell shx mkdir -p site/static/docs/$npm_package_version_short/dist/ && cross-env-shell shx cp -r dist/css/ site/static/docs/$npm_package_version_short/dist/",
-    "css-main": "npm-run-all css-lint css-compile-main css-prefix-main css-minify-main css-copy",
+    "css": "npm-run-all css-compile css-prefix css-minify",
+    "css-main": "npm-run-all css-lint css-compile-main css-prefix-main css-minify-main",
     "css-docs": "npm-run-all css-compile-docs css-prefix-docs* css-minify-docs",
     "css-compile": "npm-run-all --parallel css-compile-*",
-    "css-compile-main": "node-sass --output-style expanded --source-map true --source-map-contents true --precision 6 scss/ -o dist/css/ && npm run css-copy",
+    "css-compile-main": "node-sass --output-style expanded --source-map true --source-map-contents true --precision 6 scss/ -o dist/css/",
     "css-compile-docs": "cross-env-shell node-sass --output-style expanded --source-map true --source-map-contents true --precision 6 site/static/docs/$npm_package_version_short/assets/scss/docs.scss site/static/docs/$npm_package_version_short/assets/css/docs.min.css",
     "css-lint": "npm-run-all --continue-on-error --parallel css-lint-*",
     "css-lint-main": "stylelint \"scss/**/*.scss\" --cache --cache-location .cache/.stylelintcache",
@@ -38,11 +37,10 @@
     "css-prefix-main": "postcss --config build/postcss.config.js --replace \"dist/css/*.css\" \"!dist/css/*.min.css\"",
     "css-prefix-docs": "cross-env-shell postcss --config build/postcss.config.js --replace \"site/static/docs/$npm_package_version_short/assets/css/*.css\" \"site/static/docs/$npm_package_version_short/assets/css/*.css\"",
     "css-prefix-docs-examples": "postcss --config build/postcss.config.js --replace \"site/content/**/*.css\" \"site/content/**/*.css\"",
-    "js": "npm-run-all js-compile js-minify js-copy",
-    "js-copy": "cross-env-shell shx mkdir -p site/static/docs/$npm_package_version_short/dist/ && cross-env-shell shx cp -r dist/js/ site/static/docs/$npm_package_version_short/dist/",
+    "js": "npm-run-all js-compile js-minify",
     "js-main": "npm-run-all js-lint js-compile js-minify-main",
     "js-docs": "npm-run-all js-lint-docs js-minify-docs",
-    "js-compile": "npm-run-all --parallel js-compile-* --sequential js-copy",
+    "js-compile": "npm-run-all --parallel js-compile-*",
     "js-compile-standalone": "rollup --environment BUNDLE:false --config build/rollup.config.js --sourcemap",
     "js-compile-standalone-esm": "rollup --environment ESM:true,BUNDLE:false --config build/rollup.config.js --sourcemap",
     "js-compile-bundle": "rollup --environment BUNDLE:true --config build/rollup.config.js --sourcemap",
@@ -64,14 +62,12 @@
     "lint": "npm-run-all --parallel js-lint css-lint",
     "coveralls": "shx cat js/coverage/lcov.info | coveralls",
     "docs": "npm-run-all css-docs js-docs docs-build docs-lint",
-    "predocs-build": "npm-run-all css-copy js-copy",
     "docs-build": "hugo --cleanDestinationDir",
     "docs-compile": "npm run docs-build",
     "docs-production": "cross-env HUGO_ENV=production npm run docs-build",
     "docs-linkinator": "linkinator _gh_pages --recurse --silent --skip \"^(?!http://localhost)\"",
     "docs-vnu": "node build/vnu-jar.js",
     "docs-lint": "npm-run-all --parallel docs-vnu docs-linkinator",
-    "predocs-serve": "npm-run-all css-copy js-copy",
     "docs-serve": "hugo server --port 9001 --disableFastRender",
     "docs-serve-only": "serve _gh_pages --listen 9001",
     "update-deps": "ncu -a -x karma-browserstack-launcher && npm update && cross-env-shell echo Manually update \\\"site/static/docs/$npm_package_version_short/assets/js/vendor/\\\"",