GitLab

configs/releng/*:
Remove the SPDX license identifier comment from the configuration files in the profile, as they are not eligible for
copyright.

LICENSE:
Add GPL-3.0 license.

{{archiso,configs}/*,.editorconfig,.gitlab-ci.yml}:
Add SPDX license identifier.

Makefile:
Add SPDX license identifier.
Install the `run_archiso.sh` script as global executable `run_archiso`.
Use -D and -t flags to install to install files more generically (without a previous call to install the directory).

README.rst:
Add README outlining the project's scope, how to build images from the profiles and how to test.

AUTHORS.rst:
Add list of all direct contributors to the repository.

CONTRIBUTING.rst:
Add basic contribution guidelines, explaining the linter and the license in use.

Closes #7
Closes #3

Two purposes:
 * systemd filename friendly: "-" is used for "/" and must be escaped with "\x20"
 * ISO9660 filename friendly: "-" is replaced with "_"

* We use a rc.conf file loser to the upstream default.
* Use the recommend config files to setup hostname, locale, timezone and console

EDIT (Gerardo): Add empty FONT= and use ln -f for localtime
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>
Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>