Update dockerfiles

[pazara18]

I've updated the base and gcc dockerfiles and the documentation for the migration from C/Python API to pybind11.

I have added the gcc Dockerfile only for reference. Ideally, you would publish the image autopas/build-base image on Dockerhub and all dockerfiles which inherit it (archer, clang, code-coverage, doxygen, gcc) should have pybind11 and nlohmann-json3-dev installed without adding those lines since they inherit from that image.

If you wouldn't want to include these packages in the README for these dockerfiles, please delete the lines I've added.

[SteffenSeckler]

Fyi: if the Json parsing is performance relevant, it's likely better to not use the nlohman json parser. See also this discussion: https://www.reddit.com/r/cpp/s/9bEsfCrqeo

Though I suspect that the Json parsing isn't performance relevant...

[pazara18]

From what I've noticed, the parser doesn't introduce any noticable performance issues, probably because the JSONs used are very small. I could go back to a substring-search based approach instead of a parser but this is more elegant and could be useful in the future.