common: enable sphinxcontrib ansi and programoutput support

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
build: move version setup from conf.py up to Makefile

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
content: release-notes: fix links to relatede layer

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
content: yocto-tutorial: fix indentation

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>