Several minor formatting and linking improvements

 * Reduce the number of clicks to get to docs.
 * Add latest release section to main readme
 * Replace broken images in the interceptors guide
 * Move the index of guides to a readme so GitHub will show it better
Revise image links to work with github content.
Re-add license to documentation files
Merge branch 'pr/273'

Conflicts:
	README.md
	guides/documentation/readme.md