Update Help menu to include more links - split out docs (#15688)
Fixes #14631
Summary of the issue:
Documentation (user guide, changes, licence, etc) could be moved out of the help menu to be better grouped.
The NVDA help menu would be improved with a link to NV Access's "Get help" web page, as well as the NV Access Shop for training materials.
Description of development approach
New helper functions were created for each updated section of the NVDA menu.
The usage of https://nvda-project.org/ was updated to the current NV Access website URL, and the entry for the Menu item has changed from "NVDA website" to "NV Access website".
The donation URL was updated to use the https version of the NV Access website URL
