chore(webpack): Move to shared code for entrypoints and use webpack serve public path

Signed-off-by: Julius Härtl <jus@bitgrid.net>

src/shared-init.js

@@ -0,0 +1,12 @@
+import { generateFilePath } from '@nextcloud/router'
+
+// eslint-disable-next-line
+__webpack_nonce__ = btoa(OC.requestToken)
+
+if (!process.env.WEBPACK_SERVE) {
+	// eslint-disable-next-line
+	__webpack_public_path__ = generateFilePath('deck', '', 'js/')
+} else {
+	// eslint-disable-next-line
+	__webpack_public_path__ = 'http://127.0.0.1:3000/'
+}