docs: add DUX information

* update file script to remove "Issues: " lines from definition changelog

* update backend submodule

* add dux half release compatible definition zips

* add automatic addition of header section to the definition CHANGELOG.md

* change submodule repo from which are definition zips retrieved

* remove unwanted page

* update openapi docs

* update user creation commands via shell

* add updated definition docs

* add updated definition changelog

* add Dux Half Release into version table

* update supported definition version by editor

* update platforms changelog (on-demand, guests, password change)

* add version compatibility section into tech docs

* fix copyright year