Fix images not showing on PyPI readme (#29)

* Add smoother release workflow with bumpver (#23)

- Make version dynamic via hatchling regex source (single source of
  truth: tidydraws/__init__.py), removing the literal version from
  pyproject.toml so it can never drift
- Add bumpver config scoped to __init__.py with pre_commit_hook that
  re-derives uv.lock into the same commit
- Add make release-patch/minor/major targets
- Add release.yml workflow: tag push creates GitHub Release with
  auto-generated notes, which then triggers publish.yml
- Simplify publish.yml: removed fragile inline version assertion
- Add scripts/pre-bump.sh (uv lock + git add uv.lock)
- Add venv-*/ to .gitignore to prevent stray venvs breaking uv build
- Add Releasing section to CONTRIBUTING.md
- GitHub: enforce_admins off (admin direct-push for bumps), tag
  protection ruleset (admin-only version tags), release environment
  requires admin approval for PyPI upload

* Use absolute GitHub raw URLs for images so they render on PyPI

Closes #9

Author: drbenvincent

README.md

@@ -1,6 +1,6 @@
 # tidydraws
 
-![tidydraws logo](docs/assets/logo.jpg)
+![tidydraws logo](https://raw.githubusercontent.com/drbenvincent/tidydraws/main/docs/assets/logo.jpg)
 
 > A tidybayes-inspired data layer for declarative Bayesian visualisation in Python
 
@@ -12,7 +12,7 @@
 | [`prediction_draws()`](https://drbenvincent.github.io/tidydraws/docs/examples/prediction_draws.html) | prediction | ribbon + line, fit + data |
 | [`compare_draws()`](https://drbenvincent.github.io/tidydraws/docs/examples/compare_draws.html) | comparison | prior vs posterior, intervals |
 
-![tidydraws example](docs/assets/index-plot.png)
+![tidydraws example](https://raw.githubusercontent.com/drbenvincent/tidydraws/main/docs/assets/index-plot.png)
 
 ## Install