More mower manuals added

22 more mower manuals have been added to the site recently, for the following brands:

- Cub Cadet: 4 mower manuals
- Greenworks: 3 mower manuals (and 1 bad link fixed)
- Husqvarna: 1 mower manual, 1 mower parts list
- Weed Eater: 9 mower manuals, 4 mower parts lists