Liquid "include" tag is deprecated

[pdehaan]

Per: https://shopify.dev/api/liquid/tags/deprecated-tags#include and https://liquidjs.com/tags/include.html

"[The include] tag is deprecated, use render tag instead for better encapsulation."

We might want to update the https://www.11ty.dev/docs/languages/liquid/ docs and possibly call out the deprecation/replacement, {% render %} tag (added in [email protected]).