docs: bundle assets with Hugo

Also:

* load any docs' third-party dependencies from node_modules (except for examples)
* exclude docsearch from layouts that don't use it
* preconnect to algolia only when not examples layout
* switch to `RelPermalink`
* refactor JS assets into partials

package.json

@@ -82,7 +82,7 @@
     "docs-serve": "hugo server --port 9001 --disableFastRender --noHTTPCache --renderToMemory --printPathWarnings --printUnusedTemplates",
     "docs-serve-only": "npx sirv-cli _site --port 9001",
     "lockfile-lint": "lockfile-lint --allowed-hosts npm --allowed-schemes https: --empty-hostname false --type npm --path package-lock.json",
-    "update-deps": "ncu -u -x jasmine,karma-browserstack-launcher,karma-rollup-preprocessor && echo Manually update site/assets/js/vendor",
+    "update-deps": "ncu -u -x jasmine,karma-browserstack-launcher,karma-rollup-preprocessor",
     "release": "npm-run-all dist release-sri docs-build release-zip*",
     "release-sri": "node build/generate-sri.mjs",
     "release-version": "node build/change-version.mjs",
@@ -106,14 +106,17 @@
     "@babel/cli": "^7.23.9",
     "@babel/core": "^7.24.0",
     "@babel/preset-env": "^7.24.0",
+    "@docsearch/js": "^3.6.0",
     "@popperjs/core": "^2.11.8",
     "@rollup/plugin-babel": "^6.0.4",
     "@rollup/plugin-commonjs": "^25.0.7",
     "@rollup/plugin-node-resolve": "^15.2.3",
     "@rollup/plugin-replace": "^5.0.5",
+    "@stackblitz/sdk": "^1.9.0",
     "autoprefixer": "^10.4.18",
     "bundlewatch": "^0.3.3",
     "clean-css-cli": "^5.6.3",
+    "clipboard": "^2.0.11",
     "cross-env": "^7.0.3",
     "eslint": "^8.57.0",
     "eslint-config-xo": "^0.44.0",