Documentation integration (#4653)

* Add documentation under docs/ directory

* Add CI workflow for mkdocs configuration checking

* Add documentation issue template

* update pip-tools?

* Update .gitignore files

* Fix .gitignore rules

* Improve release notes page

* remove references to old repo

docs/ci/check_mkdocs_config.py

@@ -0,0 +1,16 @@
+"""Check mkdocs.yml config file for errors."""
+
+import os
+
+import yaml
+
+here = os.path.dirname(__file__)
+
+tld = os.path.abspath(os.path.join(here, '..'))
+
+config_file = os.path.join(tld, 'mkdocs.yml')
+
+with open(config_file, 'r') as f:
+    data = yaml.safe_load(f)
+
+    assert data['strict'] is True