♻️(frontend) all dev origins when using the tilt environment

When developping using the tilt environment, we need to allow the domain
docs.127.0.0.1.nip.io in the next configuration.

Also the the customization is removed as it is not maintained.

src/frontend/apps/impress/next.config.js

@@ -6,6 +6,7 @@ const buildId = crypto.randomBytes(256).toString('hex').slice(0, 8);
 
 /** @type {import('next').NextConfig} */
 const nextConfig = {
+  allowedDevOrigins: ['docs.127.0.0.1.nip.io'],
   output: 'export',
   trailingSlash: true,
   images: {

src/helm/env.d/dev/values.impress.yaml.gotmpl

@@ -121,10 +121,6 @@ backend:
         python manage.py createsuperuser --email admin@example.com --password admin
     restartPolicy: Never
 
-  themeCustomization:
-    enabled: true
-    file_content: {{ readFile "./configuration/theme/demo.json" }}
-
   # Extra volume mounts to manage our local custom CA and avoid to set ssl_verify: false
   extraVolumeMounts:
     - name: certs