Doc: Boost Subcomponents in Use

[ax3l]

The README does not list that RedGrapes depends on Boost.
https://github.com/ComputationalRadiationPhysics/redGrapes#dependencies

• It looks like this section needs to be synchronized with the docs:
  https://redgrapes.readthedocs.io/en/dev/install.html

• Besides the boost version, can you please document which exact sub-components of the huge boost libraries are used?

• Last but not least, can boost (as a whole) be potentially be avoided altogether or replaced by single, stand-alone dependencies (which can be in boost, too)? It looks like we mainly need boost/core/demangle.hpp, boost/type_index.hpp and boost/context/continuation.hpp

[michaelsippel]

It looks like this section needs to be synchronized with the docs:

Yes the whole docs is outdated. I agree, this needs some work.

Last but not least, can boost (as a whole) be potentially be avoided altogether or replaced by single,
stand-alone dependencies (which can be in boost, too)?

That was the plan, we currently depend only on Boost.Context and type_index.
Type_index should be replaced with std::type_index and Boost.Context could be directly pulled into the repo.