Rework workflow documentation

The workflow documentation is a bit of a mess. Rework the documentation:

• Split the details out of the platform guide, making it a better high level overview of Apertis targeted more at selling the platform.
• Create an architectural document covering the basics of the Apertis workflow and how the tools used by Apertis fit together. Use pictures to help explain.
• Detailed information about workflows shifted to guides
  • Packaging guide starting to be restructured to better cover workflows by adding sections.
  • Separating out description of component repository layout into its own guide.
  • Shift image creation details to Image building guide.

While I've noticed:

• Packages have been moved from repository based sub-directories under pkg/ to pkg/ its self. Update the URLs used on the website to reflect this.

Signed-off-by: Martyn Welch martyn.welch@collabora.com

content/architecture/workflow-guide.md

@@ -76,7 +76,7 @@ appropriate developers.
 ![Binary package generation from source change](/images/workflow_binary-package-generation.svg)
 
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-Whilst the automated workflows described here provide a robust solution for
+While the automated workflows described here provide a robust solution for
 ensuring package quality and modularity these workflows clearly do not meet the
 needs of a developer actively developing or debugging a code base. To meet this
 need, Apertis provides tools to ease