Generate cpp output

[b4l]

Also deletes index.html as this should be provided on the referring side. See https://github.com/tum-bgd/webpage/pull/11

[mwernerds]

This looks good, but I fear that the cpp part will very soon take too long to regenerate. In addition, it might depend on certain hardware features being available. I would completely remove the build phase from the Makefiles (e.g., all conversion from md.in to md) and check in the md into the book instead. Then, we can create a second Makefile for the CPP examples that updates local versions of the files (e.g., in the cpp folder) and make merge or similar to copy them into the web tree (where they would be commited like non-autogenerated files).

What do you think?

[b4l]

@mwernerds this sound good to me, pushed some changes in this direction.

[b4l]

@mwernerds I resolved the merge conflicts so feel free to merge or close this pr if it is obsolete by now.