Re-implement basic concepts as tutorial notebooks

[joaander]

The following concepts pages from HOOMD v2 need to be re-written as targeted tutorials, worked into the API documentation, or brought up as part of a larger introduction tutorial series:

• Periodic boundary conditions
• Rotational degrees of freedom
• Neighbor lists
• Domain decomposition
• Autotuners
• Restartable jobs

[joaander]

Some notes:

• Periodic boundary conditions. Mentioned very briefly in the introduction tutorial Will be expanded on further in HOOMD's Box documentation in https://github.com/glotzerlab/hoomd-blue/issues/1078
• Rotational degrees of freedom. Will be a core concept in #29 .
• Neighbor lists: TODO
• Domain decomposition. Will be covered as a core concept in the MPI tutorial. Will also be documented in the new domain decomposition class in https://github.com/glotzerlab/hoomd-blue/issues/883
• Autotuners: TODO once v3 has an autotuner API.
• Restartable jobs: We could possibly cover this in a tutorial focused on how to use HOOMD with workflow tools.

[joaander]

• Neighbor lists are covered briefly in the Intro to MD tutorial. @b-butler also has plans to add a performance tuner for buffer.
• Autotuners will be covered in API documentation when written.
• Restartable jobs are covered in #57.

This issue is no longer needed.