lynis: update to 3.0.3

lynis: update to 3.0.3

The changelog of lynis 3.0.3 is available at
https://github.com/CISOfy/lynis/releases/tag/3.0.3; all changes since
lynis 3.0.1 can be inspected at https://github.com/CISOfy/lynis/releases.

lynis 3.0.2 adds detection for IPFire, so we can hope to have those
"unknown operating system" messages omitted in future. :-)

Minor adjustments to LFS and rootfile were necessary to purge unused
CI/CD stuff as well as some markdown files (licence, code of conduct,
etc. pp.) from the extracted archive.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>