Build the interactive demo with artesian

[awickert]

Builds the interactive browser demo with artesian instead of the hand-rolled block in docs/conf.py.

Why

The 43 lines in conf.py that wheeled GRLP, downloaded and self-hosted the panel/bokeh wheels, ran panel convert, and rewrote the holoviz CDN URLs were never GRLP-specific. They are now maintained once, in MNiMORPH/artesian, where their two upstream workarounds are covered by tests:

• the holoviz CDN's bokeh wheel returns HTTP 403, so the wheel URLs must be rewritten to co-located copies;
• panel convert can print a failure and still exit 0, which previously meant a missing demo with no error anywhere in the build.

What changed

conf.py drops the block in favour of an extension and a config entry:

extensions = ["artesian.sphinxext", ...]

artesian_apps = [
    {"app": "../interactive_demo/grlp_panel.py",
     "packages": [".."],
     "requirements": ["numpy", "scipy", "networkx"],
     "outdir": "_static/interactive"},
]

The remaining commits are documentation the change made stale:

• grlp_panel.py's docstring documented a raw panel convert invocation.
• interactive_demo/README.md described only the JupyterLite notebooks, never mentioned grlp_panel.py, and stated that these demos are "deliberately kept out of the ReadTheDocs site" — untrue since the Panel demo was published. Re-led on the demo that actually ships; the notebooks' own instructions and test checklist are unchanged.
• CHANGELOG.md [Unreleased] claimed the demo "depends on no external services at run time". It does: the Pyodide runtime is fetched from cdn.jsdelivr.net on first load, and panel convert hardcodes that URL. Self-hosting the wheels removes the wheel CDN, not the runtime one. Corrected before it could ship in the v3.0.0 changelog.

Verification

A full docs build was run against this branch and compared with the committed reference in docs/_static/interactive/:

• grlp_panel.js — the application itself — is identical once version numbers are normalized.
• grlp_panel.html differs on exactly 16 lines: 10 per-build UUIDs and 6 lines of panel's own 1.9.3 → 1.9.4 spinner CSS. Nothing attributable to this change.

Note before merging

docs/requirements.txt pins artesian @ git+https://github.com/MNiMORPH/artesian@main, because artesian is not yet on PyPI. This should become an ordinary version specifier at artesian's first release (tracked in MNiMORPH/artesian).

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