Need to update instruction on readme as per v6

[karandatwani92]

Need to update or add instructions for backpack v6👇❌

# [optional] Add a sidebar_content item for it
php artisan backpack:add-sidebar-content "<li class='nav-item'><a class='nav-link' href='{{ backpack_url('log') }}'><i class='nav-icon la la-terminal'></i> Logs</a></li>"

The same changes are required on the following DOCS page and on every repo's readme too.
https://backpackforlaravel.com/docs/6.x/install-optionals

[tabacitu]

Good find @karandatwani92

[karandatwani92]

• DOCS Need to update menu-item instruction for Optional Packages as per v6 docs#483
• BackupManager Need to update menu-item instruction for Optional Packages as per v6 BackupManager#123
• LogManager Need to update instruction on readme as per v6 #65
• Settings Need to update menu-item instruction on readme as per v6 Settings#128
• PageManager Need to update menu-item instruction on readme as per v6 PageManager#136
• PermissionManager
• MenuCrud Need to update menu-item instruction on readme as per v6 MenuCRUD#80
• FileManager

[tabacitu]

Merged! Thanks @karandatwani92