Updating the text of the index file so that it matches all other WordPress files

Signed-off-by: Tom McFarlin <tom@tommcfarlin.com>
renaming the plugin activation and deactivation classes

Signed-off-by: Tom McFarlin <tom@tommcfarlin.com>
updating the code comments as per the handbook

Signed-off-by: Tom McFarlin <tom@tommcfarlin.com>
updating the code comments as per the handbook

Signed-off-by: Tom McFarlin <tom@tommcfarlin.com>