Update CSS and JavaScript dependencies

- update to Bootstrap 5.2
- add build-prod for minified production builds
- drop jQuery and popper.js as well as unsupported precss
- update all build dependencies
- use build-prod in Makefile

Makefile

@@ -6,7 +6,7 @@ all: $(RESULT)
 
 $(RESULT): $(SOURCES)
 	$(YARN)
-	$(YARN) run build
+	$(YARN) run build-prod
 
 clean:
 	rm -rf static

frontend_src/_custom.scss

@@ -15,7 +15,7 @@
  limitations under the License.
  */
 
-@import "~bootstrap/scss/bootstrap";
+@import "../node_modules/bootstrap/scss/bootstrap";
 
 $dimmed_white: #f5f5f5;
 

frontend_src/index.js

@@ -15,6 +15,4 @@
  limitations under the License.
  */
 
-import 'jquery';
-import 'popper.js';
 import 'bootstrap';

package.json

@@ -4,33 +4,33 @@
   "description": "webpack setup for CAcert static web resources",
   "scripts": {
     "build": "webpack",
+    "build-prod": "webpack --mode production",
     "watch": "webpack --watch"
   },
   "private": true,
   "author": "Jan Dittberner",
   "license": "Apache-2.0",
   "devDependencies": {
-    "autoprefixer": "^9.8.6",
-    "bootstrap": "^4.5.3",
+    "autoprefixer": "^10.4.0",
+    "bootstrap": "^5.2.0",
     "browserslist": "^4.17.0",
-    "clean-webpack-plugin": "^3.0.0",
-    "copy-webpack-plugin": "^7.0.0",
-    "css-loader": "^5.0.1",
+    "clean-webpack-plugin": "^4.0.0",
+    "copy-webpack-plugin": "^11.0.0",
+    "css-loader": "^6.7.1",
     "file-loader": "^6.2.0",
-    "html-loader": "^1.3.2",
-    "jquery": "^3.5.1",
-    "mini-css-extract-plugin": "^1.3.3",
-    "popper.js": "^1.16.1",
-    "postcss-loader": "^4.1.0",
-    "precss": "^4.0.0",
+    "html-loader": "^4.1.0",
+    "mini-css-extract-plugin": "^2.6.0",
+    "@popperjs/core": "^2.11.6",
+    "postcss": "^8.0.1",
+    "postcss-loader": "7.0.1",
+    "postcss-preset-env": "^7.0.0",
     "sass": "^1.32.0",
-    "sass-loader": "^10.1.0",
-    "style-loader": "^2.0.0",
+    "sass-loader": "^13.0.0",
+    "style-loader": "^3.3.0",
     "terser-webpack-plugin": "^5.0.3",
     "url-loader": "^4.1.1",
     "webpack": "^5.11.1",
     "webpack-cli": "^4.3.1",
-    "webpack-manifest-plugin": "^3.0.0"
-  },
-  "dependencies": {}
+    "webpack-manifest-plugin": "^5.0.0"
+  }
 }

webpack.config.js

@@ -79,7 +79,6 @@ module.exports = {
                         postcssOptions: {
                             plugins: [
                                 [
-                                    'precss',
                                     'autoprefixer',
                                 ],
                             ],