feat(next-drupal): remove unneeded previewSecret option/env variable

Fixes #661

Author: JohnAlbin

.env.example

@@ -8,8 +8,5 @@ NEXT_IMAGE_DOMAIN=site.example.com
 DRUPAL_CLIENT_ID=Retrieve this from /admin/config/services/consumer
 DRUPAL_CLIENT_SECRET=Retrieve this from /admin/config/services/consumer
 
-# Required for Preview Mode
-DRUPAL_PREVIEW_SECRET=Retrieve this from /admin/config/services/next
-
 # Required for On-demand Revalidation
 DRUPAL_REVALIDATE_SECRET=Retrieve this from /admin/config/services/next

.turbo/turbo-build.log

@@ -3,14 +3,12 @@ import { DrupalClient } from "next-drupal"
 const baseUrl: string = process.env.NEXT_PUBLIC_DRUPAL_BASE_URL || ""
 const clientId = process.env.DRUPAL_CLIENT_ID || ""
 const clientSecret = process.env.DRUPAL_CLIENT_SECRET || ""
-const previewSecret = process.env.DRUPAL_PREVIEW_SECRET
 
 export const drupal = new DrupalClient(baseUrl, {
   auth: {
     clientId,
     clientSecret,
   },
-  previewSecret,
 })
 
 export const graphqlEndpoint = drupal.buildUrl("/graphql")