Fix Windows (WSL) build

[chrisglein]

Changes made by agents to get local WSL testing and hosting working. Which for me has never worked in this repo ever, as documented in #42, and will enable me to iterate on the site more directly and more confidently.

Changes

• Rewrite songs-to-json (python) as songs-to-json.js (node) to drop the python/shebang dependency
• Replace shell 'cp' in build with a cross-platform node fs.cpSync call
• Quote nodemon -e pattern with double quotes for cmd/PowerShell
• Add patch-package + postinstall and patches/ for pug-pack coffeescript compilation

Fixes #42

More detailed agent description below. My main 🤨 to the whole thing was it's struggles with Python, which I very much have access to in other environments so I don't know what's up with that. But moving it to JS seems... 🤷‍♂️ fine. I was just happy to finally be able to host the site.

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Fix Windows build

Why

The build didn't run on Windows. Three hard blockers:

• ./songs-to-json is a Python script (#!/usr/bin/env python3) — requires Python and a POSIX shell; cmd/PowerShell can't exec it.
• cp Songbook.pdf dist uses the Unix cp, which doesn't exist on Windows.
• nodemon -e '*' uses single quotes, which Windows cmd treats literally (breaks the watch glob).

Plus pug-pack failed to compile the :coffeescript blocks in index.pug because it relied on pug hoisting jstransformer-coffeescript to the top level, which didn't resolve here.

What changed

• songs-to-json → songs-to-json.js: same logic in Node (already a build dependency). Reads UTF-8 with a latin-1 fallback like before, and now normalizes CRLF→LF so output is byte-identical regardless of checkout line endings.
• build script: cp replaced with a Node fs.cpSync one-liner.
• dev script: -e '*' → -e "*".
• patch-package + pug-pack+1.11.0.patch: patches pug-pack to compile :coffeescript blocks with its bundled compiler instead of depending on module hoisting. Applied automatically via a postinstall hook.

Compatibility outside Windows

No regressions on macOS/Linux — every replacement uses cross-platform tooling:

• Node (fs.cpSync, the JS script) is already required to build and behaves identically on all platforms.
• Double quotes are valid in POSIX shells, so -e "*" is unchanged behavior there.
• patch-package is a standard cross-platform npm tool; the patch changes pug-pack's behavior the same way everywhere, making it more robust (no reliance on dependency hoisting), not Windows-specific.
• The only removed dependency is the Python interpreter, which the rest of the toolchain never needed.

Net: unblocks Windows, changes nothing observable for existing Unix users.