overview-manual: SVG diagram for the git workflow

Set in full-width mode to make it ready in PDF
and EPUB outputs.

(From yocto-docs rev: 394c7c26c6591153670c67740d9a64f54725321b)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Quentin Schulz <foss@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/overview-manual/development-environment.rst

@@ -286,8 +286,8 @@ develop, test, and submit changes to "contrib" areas for the maintainer
 to examine. The maintainer then chooses which changes are going to
 become a permanent part of the project.
 
-.. image:: figures/git-workflow.png
-   :align: center
+.. image:: svg/git-workflow.*
+   :width: 100%
 
 While each development environment is unique, there are some best
 practices or methods that help development run smoothly. The following