chore: Add README, .nvmrc, and package.json scripts for local dev setup

[anyelopetit]

Add README, .nvmrc, and package.json scripts for local developer setup

The hellotext/help repo had no README, no Node version file, and no runnable scripts. A new contributor had no documented path to install, serve, or build the site locally.

What this adds

File	Change
README.md	New — prerequisites, install, serve, build, project structure, "adding a guide" walkthrough, deployment notes.
.nvmrc	New — pins Node 18, matching NODE_VERSION in netlify.toml.
package.json	Adds scripts block (setup, serve, build). No dependency changes.

New scripts

"scripts": {
  "setup": "bundle install && yarn install",
  "serve": "bundle exec jekyll serve",
  "build": "JEKYLL_ENV=production bundle exec jekyll build"
}

yarn build is the repeatable verification command — it runs the exact same command Netlify runs (see netlify.toml).

Why JEKYLL_ENV=production is required

Plain bundle exec jekyll build fails with:

Could not connect to the PostCSS server

The jekyll-postcss plugin expects its dev server when serving locally. For a one-off build you must set JEKYLL_ENV=production. This is documented in the README under the Gotcha callout so contributors aren't surprised.

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