We set it now for xwayland-satellite integration.

This should make `uwsm start niri.desktop` possible like with other compositors.

* make niri-session POSIX compatible

* Update resources/niri-session

---------

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

* Added dinit services

* Added dinit support to niri-session

* Replaced shutdown script for dinit with a single command execution

* Added dinit service files to Getting Started install tables

* Fix typo in resources/dinit/niri

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

* Fixed mistakes in wiki/Getting-Started.md

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

* niri-session does not start dinit anymore

---------

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

* Fix typos reported by "typos" crate

https://github.com/crate-ci/typos

* Ignore typo datas -> data

See https://github.com/crate-ci/typos?tab=readme-ov-file#false-positives
for more configureability.

---------

Co-authored-by: Carl Hjerpe <git@hjerpe.xyz>
Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

Sometimes graphical-session.target lingers on after niri quits, leading
to services not being started on a quick relogin. To work around this,
add and run a systemd target that conflicts with
graphical-session.target and forces its shutdown.

The trick is inspired by `gnome-session`.