Refactor/tck test formatting (#323)

* Fix for bug, caused by returning a union

* Docs media (#310)

* config: remove codeowners

* docs: add some media links

* docs: change links to list

* Update README.md

Capitalise NODES

* docs: add wills talk to list

Co-authored-by: Darrell Warde <8117355+darrellwarde@users.noreply.github.com>

* Version update

* Fixed tests broken after merge

* Refactor headings and add markdownlint config to allow nested heading re-use

* Use code block tags which allow formatting

* Replace ```schema with ```graphql

* Slight markdownlint config tweak

* Merge branch '2.0.0' into refactor/tck-test-formatting

Co-authored-by: Daniel Starns <danielstarns@hotmail.com>
Co-authored-by: Neo Technology Build Agent <continuous-integration+build-agent@neotechnology.com>

packages/graphql/tests/tck/tck-test-files/.markdownlint.json

@@ -0,0 +1,5 @@
+{
+    "default": true,
+    "MD013": { "code_blocks": false },
+    "MD024": { "siblings_only": true }
+}