Update README.md
layouts
themes and layouts
Merge remote-tracking branch 'origin/DevDocs-19-M8' into DevDocs-19-M8
layouts overview and types
layots v100500
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	.gitignore
	README.md
Merge remote-tracking branch 'upstream/develop' into develop
layout overview is final
layout overview final v.2
overview and extend final
Merge remote-tracking branch 'upstream/develop' into develop
Minor edit to layout page front matter
update gitignore
Delete _config.internalM18.yml
Delete jkM18.bat
Changes to troubleshooting
Merge remote-tracking branch 'origin/DevDocs-19-M8' into DevDocs-19-M8

Conflicts:
	guides/v1.0/frontend-dev-guide/layouts/layout-extend.md
	guides/v1.0/frontend-dev-guide/layouts/layout-override.md
Fix API issues in Getting Started book
Merge pull request #455 from Magento/develop

Update Release Notes with samle data instrux and other updates