Change <img> tags to ![markdown](syntax "images")

Unless we need to explicitly define the width, height and border attributes in the <img> tags for some reason, I suggest that we keep markdown files written in pure markdown syntax where possible.
Merge pull request #5 from uberbuilder/master

start-with-project-stub: Re-wording suggestion for introduction.
Merge pull request #6 from uberbuilder/markdown-syntax

Change <img> tags to ![markdown](syntax "images")