Build images with docker

[Cyb10101]

I accidentally created a docker container to build the images. Very bad but it works. xD

What this does: gnuclad is installed in an Ubuntu, then an SVG is created with gnuclad using script "build-docker.sh" and then converted with Inkscape.

Or simply:

docker-compose build
docker-compose run linux-time-line

Inkscape just because I was too lazy to find the bug for ImageMagick.

Note: The line "Change links to distrowatch" in build-docker.sh is not to troll, it just made my life easier at the current moment. Just delete or keep it.

Don't know if this pull request is interesting and it is definitely better to use the right system and construction tools.