updated links to use sphinx-ext-linkcode to create links

[melechlapson]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[Eric-Arellano]

Thanks! CI failed because you needed to run tox -e fmt. #590 fixes the other CI issues.

Btw, in case this wasn't clear, we don't want to actually merge this PR. This PR was an experiment to see how the extension works. So don't be alarmed that this doesn't get merged. It still was super helpful to open up. I'm writing up next steps on Qiskit/documentation#517.

Btw one tip for open source work: it's useful in your PR description to give more context about what's going on, like linking to Qiskit/documentation#517.

[melechlapson]

Thanks for the tips. I figured that this wasn't really going to be merged so I didn't add a description or link the issues.

[Eric-Arellano]

This has been implemented in Runtime and Provider, so closing because this experiment did its job. Thanks!