Add versioneer as build requirement in documentation

[ndgrigorian]

This PR adds to the documentation that versioneer is a build requirement for dpctl.

It is listed in pyproject.toml, but not referenced in docs.

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[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[oleksandr-pavlyk]

I may have spoken too soon. Two CI jobs on Linux failed, but I do not yet understand whether the failure was caused by this change, or by a change in conda toolchain

[ndgrigorian]

I may have spoken too soon. Two CI jobs on Linux failed, but I do not yet understand whether the failure was caused by this change, or by a change in conda toolchain

It must be the Conda toolchain, this only changes the documentation, which built fine too

[coveralls]

coverage: 87.734%. first build
when pulling 1326b36 on add-versioneer-to-how-to-build
into a7e85a2 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.19.0dev0=py310h93fe807_474 ran successfully.
Passed: 894
Failed: 2
Skipped: 118