Bug fixes

Delete unnecessary controller file.

Update README.md file.
Updated info.yml file.

Changes since 8.x-1.0-alpha2:

• #2994194 by nedjo: Mismatch in service ID for config snapshot in service provider and trait

New release with a small fix on the field widget and some typo fix.

#2855688 : control of permissions switch position when more than three
#2986518 : Update tests because button "Save and keep published" doesn't exist anymore