docs: Update docs README with more context about pyrexpaint library

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Expands the library description in docs/README.md to explain that pyrexpaint loads .xp files into Python programs, and adds context about the .xp file format being used by REXPaint, a popular ASCII art editor for roguelike game development.

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Web UI: Update docs/README.md to include two more sentences about th...

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I've completed your request. Here's a summary of what I did:

Summary

I updated docs/README.md to expand the library description from one sentence to include two more meaningful sentences about pyrexpaint:

Before:

pyrexpaint is a python library

After:

pyrexpaint is a python library for loading .xp files into Python programs. The .xp file format is the custom binary format used by REXPaint, a popular ASCII art editor commonly used in roguelike game development.

The two additional sentences explain:

1. What the library does — loads .xp files into Python programs
2. What .xp files are — the custom binary format from REXPaint, with a link to REXPaint and context about its use in roguelike development

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[mattlink]

@Promptless please review the doc changes for any typos or semantic errors