feat: add manpages and improve service docs

assets/services/README.md

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+# Service Files
+This folder contains the files necessary to set up lidm on start up for the supported init systems, all of them are configured for tty7.
+
+If you don't know what a init system is, you're certainly using `systemd`.
+
+There's make scripts to automatically copy the service files to the proper locations, you just have to run `make install-service-$INIT`. `make install-service` will attempt to detect the init system in use and install for it.
+
+The manuall steps for installation are:
+
+## Systemd
+* Copy `systemd.service` to `/etc/systemd/system/lidm.service`.
+* To enable it you can run `systemctl enable lidm`
+
+## Dinit
+* Copy `dinit` to `/etc/dinit.d/lidm`.
+* To enable it, run `dinitctl enable lidm`.
+
+## Runit
+* Copy `runit/` to `/etc/runit/sv/lidm/`.
+* Add the service with `ln -s /etc/runit/sv/lidm /run/runit/service`.
+* And to enable it `sv enable lidm`
+
+> [!WARNING]
+> Make sure to disable any other service that might run on tty7, such us lightdm or most display managers out there.