Move away from hatch-vcs

[nathanjmcdougall]

Motivation
Based on some (fascinating) conversations happening at:

• https://www.github.com/astral-sh/uv/issues/7533
• https://discuss.python.org/t/pep-751-now-with-graphs/69721/86
• https://discuss.python.org/t/brainstorming-eliminating-dynamic-metadata/71405

I am convinced that VCS-generated versioning does more harm than good for simple project workflows, at least right now. I am not convinced that all dynamically generated metadata should be considered harmful, e.g. it's nice to generate URLs based on the project name, the README metadata is effectively dynamically generated from the README file itself, etc.

I think it's fine for now but this issue will be blocking #117.

What we will need is a task running tool - #131 - so that we can do automated releases with hatch version etc., and build changelogs etc. in one step. So I think that's the pre-requisite for this.

Summary of desired enhancement
Stop using hatch-vcs, and in general stop using dynamically generated versions for the project.