docs: document deploy.js

[chrisriv10]

Closes #37

What: Added plain explanatory comments to src/commands/deploy.js in the house style (matching add.js/setup.js, no JSDoc tags):

• top-of-file block explaining Vite build + Wrangler deploy of dist/ to Cloudflare Pages, run from user project dir via process.cwd()
• note above try/catch on loading generated globalVariables.js and why ERR_MODULE_NOT_FOUND gets a friendly setup hint
• one-liner above npxCommand on the Windows .cmd quirk
• two-stage notes above each execSync (Vite build, then Wrangler deploy)

Why: deploy.js had zero comments; this documents intent for newcomers per issue #37.

Testing: comments-only, no behavior change. Verified git diff shows 14 insertions, 0 deletions (comments/blank lines only) and node --check src/commands/deploy.js passes.

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[WesleyHanauer]

Great work, thanks.