New Theme Integration

New theme integration shouldn't have any issues because of all major changes implemented via custom mu-plugins and ACF plugin and current theme response only for the templates (pageview).

• custom Posts declared in mu-plugin "register-entities."
• custom pages declared via custom template in the theme
• custom page data provided via ACF plugin and meta fields which declared in mu-plugin "register-entities" (ACF Docs, Meta fields Docs)
• pantheon recommended plugins (Pantheon Docs)
•  key management provided via Lockr plugin (Lockr) and keys defined in mu-plugin lockr-keyring.php
• theme required modifications stored  in themes/"theme_name"/app

Known issues

Pantheon integration known issues: https://pantheon.io/docs/modules-plugins-known-issues/#wordpress-plugins