More shareable script interface

[HighDiceRoller]

This might resemble AnyDice, or perhaps something more REPL-like.

[HighDiceRoller]

Probably worth at least chucking a REPL online.

[HighDiceRoller]

Evaluation of current options:

JupyterLite

Pros:

• Nice UI.
• Can be mixed with Markdown when done in notebooks.

Cons:

• Long loading time.
• matplotlib is not particularly fast, and is kind of verbose.
• Limited custom controls.

PyScript

Pros:

• Easier to set up than Pyodide in theory.

Cons:

• Not a mature technology yet.

Direct Pyodide

Pros:

• Fast.
• More mature than PyScript.

Cons:

• Requires more boilerplate than PyScript.

Without a known development timeline for PyScript, I think I'm going to go with Pyodide for now.

[HighDiceRoller]

Basic version implemented.