style: remove master doc link from logo

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
common: describe Python virtualenv setup

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
common: more ignored files

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
common: improve PDF build

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
style: expand CSS font-family definitions

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
common: fix email address

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
release-notes: expand and renew document structure

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
yocto-tutorial: expand and renew document structure

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