♻️(frontend) Marianne single source of truth

We now use Marianne font from @gouvfr-lasuite/ui-kit
package instead of a versionned local copies.
This ensures we always use the latest version of
the font.
During a build or dev command, Marianne font files
are copied from node_modules to the public assets
folder. They can stop being versionned.

src/frontend/apps/impress/package.json

@@ -77,6 +77,7 @@
     "@types/react": "*",
     "@types/react-dom": "*",
     "@vitejs/plugin-react": "5.0.2",
+    "copy-webpack-plugin": "13.0.1",
     "cross-env": "10.0.0",
     "dotenv": "17.2.2",
     "eslint-plugin-docs": "*",