Installed webpack encore and configured js and css to use it.

config/bundles.php

@@ -12,4 +12,5 @@ return [
     Symfony\Bundle\MonologBundle\MonologBundle::class => ['all' => true],
     Symfony\Bundle\MakerBundle\MakerBundle::class => ['dev' => true],
     Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle::class => ['all' => true],
+    Symfony\WebpackEncoreBundle\WebpackEncoreBundle::class => ['all' => true],
 ];

config/packages/webpack_encore.yaml

@@ -0,0 +1,49 @@
+webpack_encore:
+    # The path where Encore is building the assets - i.e. Encore.setOutputPath()
+    output_path: '%kernel.project_dir%/public/build'
+    # If multiple builds are defined (as shown below), you can disable the default build:
+    # output_path: false
+
+    # Set attributes that will be rendered on all script and link tags
+    script_attributes:
+        defer: true
+        # Uncomment (also under link_attributes) if using Turbo Drive
+        # https://turbo.hotwired.dev/handbook/drive#reloading-when-assets-change
+        # 'data-turbo-track': reload
+    # link_attributes:
+        # Uncomment if using Turbo Drive
+        # 'data-turbo-track': reload
+
+    # If using Encore.enableIntegrityHashes() and need the crossorigin attribute (default: false, or use 'anonymous' or 'use-credentials')
+    # crossorigin: 'anonymous'
+
+    # Preload all rendered script and link tags automatically via the HTTP/2 Link header
+    # preload: true
+
+    # Throw an exception if the entrypoints.json file is missing or an entry is missing from the data
+    # strict_mode: false
+
+    # If you have multiple builds:
+    # builds:
+        # pass "frontend" as the 3rg arg to the Twig functions
+        # {{ encore_entry_script_tags('entry1', null, 'frontend') }}
+
+        # frontend: '%kernel.project_dir%/public/frontend/build'
+
+    # Cache the entrypoints.json (rebuild Symfony's cache when entrypoints.json changes)
+    # Put in config/packages/prod/webpack_encore.yaml
+    # cache: true
+
+framework:
+    assets:
+        json_manifest_path: '%kernel.project_dir%/public/build/manifest.json'
+
+#when@prod:
+#    webpack_encore:
+#        # Cache the entrypoints.json (rebuild Symfony's cache when entrypoints.json changes)
+#        # Available in version 1.2
+#        cache: true
+
+#when@test:
+#    webpack_encore:
+#        strict_mode: false