Update README.md

fix order of includes and pragma once

Merge pull request #154 from esa/tuneForMPI

freeze github runner version

Ensure autopas/desiredCellsPerDimension is at least 3 to prevent div by zero

Make README the homepage of the docs

Add plot about average number of migrants

combine MPI_Reduce calls

fix scope of variables

gater migrant information from csv files

add comparison plots to vvl

update plot notebook

Notebook for runtime analysis

make `get` function in getTimers.sh more generic

fix typo in var name