console/frontend: remove "preview" command

This is not really needed. See
https://stackoverflow.com/questions/71703933/what-is-the-difference-between-vite-and-vite-preview

And document how to work on the frontend part more easily.

CONTRIBUTING.md

@@ -45,6 +45,11 @@ Akvorado, then use `docker compose up` to run Docker compose. Beware to not
 destroy the volume for GeoIP at each tentative as there is a per-day limit on
 the number of times one IP can fetch the GeoIP database.
 
+If you need to work on the frontend part, you can spawn the Docker compsoe
+setup, then in `console/frontend`, use `npm run dev` and point your browser to
+`http://localhost:5173` instead of `http://localhost:8080`. Any change of
+frontend-related files should be applied immediately.
+
 # Licensing
 
 The code is licensed under AGPL-3.0-only. When creating new files, be sure to

console/frontend/package.json

@@ -7,7 +7,6 @@
     "dev": "vite",
     "build": "run-p type-check build-only",
     "build-only": "vite build",
-    "preview": "vite preview",
     "type-check": "vue-tsc --noEmit -p tsconfig.vitest.json --composite false",
     "lint": "eslint '{src/**/,}*.{js,ts,vue}'",
     "format": "prettier --log-level warn --write '{src/**/,}*.{ts,js,vue,html}'",