Add educators workshop heading and contents

[rmlarose]

Most notebooks are for Cirq v0.5 and need updating/polishing. Putting in now as placeholder for devsite.

[balopat]

LGTM - I did merge the other ion device PR though - can you remove that from either this one or in a new PR?

[rmlarose]

LGTM - I did merge the other ion device PR though - can you remove that from either this one or in a new PR?

Removed!

[rmlarose]

Failed tests due (mostly) to not including these in rtd_docs - do we want to include these in rtd_docs @balopat?

/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/chemistry.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/intro.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/ion_device.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/neutral_atom.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/qaoa_ising.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/textbook_algorithms.ipynb: WARNING: document isn't included in any toctree

[balopat]

Failed tests due (mostly) to not including these in rtd_docs - do we want to include these in rtd_docs @balopat?

/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/chemistry.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/intro.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/ion_device.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/neutral_atom.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/qaoa_ising.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/textbook_algorithms.ipynb: WARNING: document isn't included in any toctree

Let's add them under the same heading "Educator workshop" in rtd_docs/index.rst

[CirqBot]

Automerge cancelled: A status check is failing.

[balopat]

Failed tests due (mostly) to not including these in rtd_docs - do we want to include these in rtd_docs @balopat?

/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/chemistry.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/intro.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/ion_device.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/neutral_atom.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/qaoa_ising.ipynb: WARNING: document isn't included in any toctree
/home/runner/work/Cirq/Cirq/rtd_docs/docs/tutorials/educators/textbook_algorithms.ipynb: WARNING: document isn't included in any toctree

Let's add them under the same heading "Educator workshop" in rtd_docs/index.rst

I decided to just exclude them for now - there were too many obscure sphinx issues that I couldn't solve just now.

[CirqBot]

Automerge cancelled: A status check is failing.

[balopat]

had-to-fight-with-the-linter: conf.py seems a little bit over the top to put through formatting.