Rework of the Package Internalizer documentation

## What New Or Updated Would You Like To See?
The documentation needs updating with new graphics showing the latest version of Chocolatey for Business, and a new summary of what users can expect when using it.

## Why Is It Needed?
The documentation is outdated and needs clarification on existing verbiage and expansion on Package Internalizer's capabilities.

## Additional Context?
N/A