chore(release): rename references to vast-data/Orbit, bump to 0.1.0b2

[oualib]

Summary

Repository renamed VAST-Orbit → Orbit (the vast-data org already carries
the "VAST" prefix, so vast-data/Orbit reads cleaner and shortens every URL).
This PR updates all in-repo references to the new path, bumps the version to
0.1.0b2, and folds in small corrections. References/metadata and version only —
no API or behavioral changes.

What changed

• Repository references — updated vast-data/VAST-Orbit → vast-data/Orbit
  across pyproject.toml ([project.urls]: Homepage, Repository, Documentation,
  Issues), README.md links/badges, docs, and any CI references.
• Docs / GitHub Pages — Pages URL is now
  https://vast-data.github.io/Orbit/; updated doc links and html_baseurl
  accordingly.
• Version bump — 0.1.0b1 → 0.1.0b2 in both pyproject.toml and
  vastorbit/__init__.py (kept in sync; static versioning).
• Small corrections — minor doc/wording and metadata fixes.

Not changed (deliberately)

• Package / import name stays vastorbit (unchanged on PyPI).
• No public identifiers, class names, or code logic touched.

Follow-up (outside this PR)

• Re-point local remotes: git remote set-url origin https://github.com/vast-data/Orbit.git
• Re-publish docs to the new Pages URL (ghp-import -n -p -f build/html).
• Tag v0.1.0b2 after merge; publish once PyPI is confirmed (the old
  0.1.0b1 metadata is frozen and won't change retroactively).