Bump docs version to 2.2.0

[sethfischer]

Closes #1283

[codecov]

Codecov Report

Merging #1285 (28d006b) into master (436ab58) will not change coverage.
The diff coverage is n/a.

❗ Current head 28d006b differs from pull request most recent head f8534d1. Consider uploading reports for the commit f8534d1 to get more accurate results

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[jmwright]

@sethfischer Should the X.Y version be 2.0 or 2.2?

[sethfischer]

@jmwright, yes X.Y version should have been "2.2". Fixed.

[lorenzncode]

The 2.2.0 docs have already been built - I think this is what you see with version stable.

Rather than hardcode the version for version latest, perhaps the version can be set automatically based on the more straightforward versioning to be defined in #1286.

[adam-urbanczyk]

@lorenzncode @jmwright shall I just merge this PR?

[jmwright]

+1 to merge

[lorenzncode]

@lorenzncode @jmwright shall I just merge this PR?

Yes, please do.