Add crosslink back to fastly intro

source/content/guides/fastly-pantheon/01-introduction.md

@@ -53,6 +53,8 @@ You can refer to the following docs for common caching issues:
 - [Debug Common Cache Busters](/guides/frontend-performance/caching#troubleshoot-caching-issues)
 - [Traffic Limits and Overages](/guides/account-mgmt/traffic)
 
+You should consult the [Edge Integrations Guide](/guides/edge-integrations/) and complete the appropriate configuration for your WordPress or Drupal site if you plan on using content personalization in addition to Fastly.
+
 ## More Resources
 
 - [New Relic Performance Monitoring on Pantheon](/guides/new-relic)