Considerations for Google Analytics and PANTHEON_STRIPPED Doc Update

[carl-alberto]

Re: Considerations for Google Analytics and PANTHEON_STRIPPED

Priority: Low

Issue Description:

Help improve the caching / cookie handling / stripped cookies in Pantheon docs for customers to have a better understanding

• how cookies work with caching
• handling the data related to cookies
• workarounds on how to extract data from stripped URL query parameters

possibly affected and interconnected docs: https://docs.pantheon.io/pantheon_stripped https://docs.pantheon.io/caching-advanced-topics https://docs.pantheon.io/cookies

PR to follow