Start over.
MSBuild primer.

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Enable NuGet Package Restore.
Add psake usage to msbuild-primer project.
Web Application project with WPP basic properties.
WPP basics
Show .wpp.targets usages.

Show that .wpp.targets allows to modify build in WPP as well as
before WPP. It is also loaded and effective when publish is not enabled
(e.g. simple build in VS).
Demonstrate PackageLocation usage.
Add info on _PropertyName convention.
Minor.
Rename WPP Basics project.
Demo including, excluding files.
Demo creating empty directories.
Solution outline.