Remove qsimh mention from docs

[kris524]

Closes #772

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[gemini-code-assist]

Code Review

This pull request completely removes the hybrid Schrödinger-Feynman simulator (qsimh / QSimhSimulator) from the repository, including its binaries, build targets, Python/Pybind11 interfaces, and documentation. The review feedback highlights several necessary cleanups to prevent compilation errors and orphaned files, such as removing the pybind11 binding registration for qsimh_simulate, deleting unused source files (lib/hybrid.h, lib/run_qsimh.h, qsimcirq/qsimh_simulator.py and its tests), and removing outdated keywords from pyproject.toml.

[kris524]

Question: Do we want to remove the whole qsimh implementation as part of this MR? Or only update the docs not to mention it?

[mhucka]

Question: Do we want to remove the whole qsimh implementation as part of this MR? Or only update the docs not to mention it?

@kris524 Thank you for tackling this task.

• Regarding removing the implementation: let's leave it in for now. Sergei Isakov has made a separate PR with substantial code changes, and I'm worried that removing the qsimh code will lead to merge conflicts for that other PR. Once the other one is merged, a subsequent PR can remove the qsimh code.

• Regarding this PR: could you also remove mention of qsimh from the top-level README.md file?