Fix: cleanup packaging page and add decision tree diagram

Fix: feedback on packaging pr

Fix: cleanup packaging page and add decision tree diagram

Update package-structure-code/python-package-distribution-files-sdist-wheel.md

Co-authored-by: David Nicholson <[email protected]>

Update package-structure-code/python-package-structure.md

Co-authored-by: Henry Schreiner <[email protected]>

Author: lwasser

images/python-package-tools-decision-tree.png

@@ -95,7 +95,7 @@ the `src` directory.
 Intro <self>
 
 Python package structure <python-package-structure>
-What are SDIst & Wheel Files? <python-package-distribution-files-sdist-wheel>
+What are SDist & Wheel Files? <python-package-distribution-files-sdist-wheel>
 Package Build Tools <python-package-build-tools>
 Complex Builds <complex-python-package-builds>
 ```