* fix min-height on article and offset markdown links to allow for fixed header

* relocate target pseudo selector to mdx.js

* Edit Introduction, Getting Started, and Queries

* Edit Mutations, Document Caching, and Errors

* Fix some non-American typos

* Close sidebar on background click

* Add missing sub-page links to index pages

* Add rel="external" to external links

* Add anchor links to headings

* Fix lint errors
Co-authored-by: Phil Pluckthun <phil@kitten.sh>