Automate package publishing via CI/CD

[zachmullen]

This is an alternative proposal to #815. It has the following behavior:

• The package.json file is never updated manually in the source repo.
• An actual release is triggered by pushing a tag of the form vX.Y.Z to GitHub. This tag convention is already used by VolView.
• On any push to main, a prerelease version is published. It takes the latest stable release version from the set of manually created tags, and publishes a prerelease with the preid of dev-<git-SHA>.
• These prerelease packages are tagged with dev such that anyone who wants to follow the bleeding edge of the package can npm install volview@dev and get the latest prerelease without having to fiddle with git SHAs.

Advantages:

• CI/CD doesn't push a bunch of commits or tags to the repo. No write permission is required.
• We still maintain provenance / tracking between npm packages and git commits by virtue of the package itself containing the git commit identifier.
• The YAML is generally a little simpler and easier to comprehend.

Before we merge this, we'll need to ensure that the relevant NPM token is set in our GH Actions secrets. I also renamed publish.yml to docs.yml to make the intent of each file clearer.

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[PaulHax]

Shall we add a section in CONTRIBUTING.md for how to do the manual version bump steps?

[zachmullen]

@PaulHax PTAL at 27c1a5a. Publishing a volview package to npm is going to necessitate at least this change. But we should also completely overhaul what packages within volview are considered dev dependencies vs. runtime dependencies. Anything that is built into the dist bundle should be moved from dependencies to devDependencies so that it doesn't get unnecessarily pulled into downstreams' node_modules.