I left these off in #70 on
accident. The files are copy and pasted without changes.

This improves upon #70.
These files were basically copy and pasted from open source, so we want
to bring in the proper Git history for them.

This PR is split into four commits—and we won't squash and merge—so that
Git properly detects how the files have changed.

This update also results in us bringing in some improvements to
operators_overview that had been made in open source, like fixing typos.

Closes Qiskit#21. 

The code was copied with the below script. The closed source repository
got most of its content from open source, but did not use a Git
migration to transfer over commit history. So rather than using a Git
migration like we did with `qiskit-tutorials`
(Qiskit/qiskit#10710), this manually attributes
relevant contributors for the files they had an influence on.

```python
import shutil
import subprocess
from dataclasses import dataclass
from pathlib import Path

IQP_ROOT = Path("../iqp-channel-docs")
DOCS_ROOT = Path("./")


@DataClass(frozen=True)
class Author:
    name: str
    email: str

    def commit_line(self) -> str:
        return f"Co-authored-by: {self.name} <{self.email}>"


AXEL = Author("Axel Hernández Ferrera", "[email protected]")
ABBY_C = Author("Abby Cross", "[email protected]")
BECKY = Author("Rebecca Dimock", "[email protected]")
FRANK = Author("Frank Harkins", "[email protected]")
KEVIN = Author("Kevin Tian", "[email protected]")
JESSIE = Author("Jessie Yu", "[email protected]")
ELENA = Author("Elena Peña Tapia", "[email protected]")
PAUL_N = Author("Paul Nation", "[email protected]")
SOOLU = Author("Soolu Thomas", "[email protected]")
THOMAS_A = Author("Thomas Alexander", "[email protected]")
JAKE_L = Author("Jake Lishman", "[email protected]")
MICHAEL_H = Author("Michael Healy", "[email protected]")
MARIUS = Author("Marius Hillenbrand", "[email protected]")
REZA = Author("Reza Jokar", "[email protected]")


def main() -> None:
    # Copy images
    copy_image_folders(
        [
            "build",
            "migration",
            "optimize",
            "qiskit-ibm-runtime",
            "run",
            "start",
        ]
    )
    commit("Migrate images from closed source", [])

    # Copy TOC files
    copy_docs_files(
        [
            "build/_toc.json",
            "optimize/_toc.json",
            "run/_toc.json",
            "start/_toc.json",
            "test/_toc.json",
        ]
    )
    commit("Migrate TOC files from closed source", [AXEL])

    # Copy original content
    copy_docs_files(
        [
            "start/index.mdx",
            "start/install.mdx",
            "start/intro-to-qiskit.ipynb",
            "start/runtime.mdx",
            "build/index.mdx",
            "build/first-circuit.mdx",
            "build/operators_overview.ipynb",
            "build/primitives.mdx",
            "build/primitives-get-started.mdx",
            "build/primitives-examples.mdx",
            "build/feature-table.mdx",
            "build/backend_reset.ipynb",
            "build/pulse.ipynb",
            "test/index.mdx",
            "test/simulators.mdx",
            "optimize/index.mdx",
            "run/hardware.mdx",
            "run/instances.mdx",
            "run/backends.mdx",
            "run/estimate-job.mdx",
            "run/queue.mdx",
            "run/circuit-execution.mdx",
            "run/reserve-system-time.mdx",
            "run/retired-systems.mdx",
        ]
    )
    commit("Migrate original content from closed source", [ABBY_C, BECKY])

    # Copy hello world
    copy_docs_files(["start/hello-world.ipynb"])
    commit("Migrate Hello World guide from closed source", [FRANK, BECKY, ABBY_C])

    # Copy runtime migration guides
    copy_docs_files(
        ["start/compare.mdx", "start/migrate.mdx", "start/migrate-examples.mdx"]
    )
    commit(
        "Migrate Runtime migration guides from closed source",
        [JESSIE, KEVIN, BECKY, FRANK, ELENA],
    )

    # Copy dynamic circuits
    copy_docs_files(
        [
            "build/getting-started-with-dynamic-circuits.ipynb",
            "build/midcircuit_measurement.ipynb",
            "build/dynamic-circuits-basics-with-qiskit.ipynb",
            "build/dynamic-circuits-basics-with-openqasm3.ipynb",
        ]
    )
    commit(
        "Migrate Dynamic Circuits content from closed source",
        [SOOLU, THOMAS_A, JAKE_L, MARIUS, MICHAEL_H, REZA, BECKY, ABBY_C],
    )

    # Copy runtime content
    copy_docs_files(
        [
            "build/primitive-options.mdx",
            "test/noise.mdx",
            "optimize/algorithm-tuning-options.mdx",
            "optimize/error-mitigation.mdx",
            "optimize/error-suppression.mdx",
            "run/account-management.mdx",
            "run/sessions.mdx",
            "run/run-sessions.mdx",
            "run/monitor.mdx",
            "run/cost.mdx",
            "run/max-execution-time.mdx",
        ]
    )
    commit(
        "Migrate Runtime content from closed source",
        [JESSIE, KEVIN, BECKY, ABBY_C],
    )

    # Copy Aer tutorial
    copy_docs_files(["test/building_noise_models.ipynb"])
    commit("Migrate Aer noise model from closed source", [PAUL_N])


def copy_docs_files(files: list[str]) -> None:
    for f in files:
        dest = DOCS_ROOT / "docs" / f
        dest.parent.mkdir(parents=True, exist_ok=True)
        shutil.copy(IQP_ROOT / "docs" / f, dest)


def copy_image_folders(folders: list[str]) -> None:
    for folder in folders:
        shutil.copytree(
            IQP_ROOT / "packages" / "web" / "public" / "images" / folder,
            DOCS_ROOT / "public" / "images" / folder,
        )


def commit(msg: str, authors: list[Author]) -> None:
    subprocess.run(["git", "add", "."], check=True)
    if authors:
        author_lines = "\n".join(author.commit_line() for author in authors)
        msg += f"\n\n{author_lines}"
    subprocess.run(["git", "commit", "-m", msg], check=True)


main()
```

I left these off in Qiskit#70 on
accident. The files are copy and pasted without changes.

This improves upon Qiskit#70.
These files were basically copy and pasted from open source, so we want
to bring in the proper Git history for them.

This PR is split into four commits—and we won't squash and merge—so that
Git properly detects how the files have changed.

This update also results in us bringing in some improvements to
operators_overview that had been made in open source, like fixing typos.