docs: add usage instructions to README #100

	name: 🚀 Build & Deploy
	on:
	pull_request:
	workflow_dispatch:
	push:
	branches:
	- main

	# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
	permissions:
	contents: write
	pages: write
	id-token: write

	# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
	# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
	concurrency:
	group: pages
	cancel-in-progress: false

	defaults:
	run:
	shell: bash

	jobs:
	deploy:
	runs-on: ubuntu-latest
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	steps:
	- name: 📂 Checkout repository
	uses: actions/checkout@v4

	- name: 🥖 Setup Bun
	uses: oven-sh/setup-bun@v2
	with:
	bun-version: latest

	- name: 🗃️ Restore cache
	uses: actions/cache@v4
	with:
	path: \|
	public
	.cache
	key: ${{ runner.os }}-gatsby-build-${{ hashFiles('public') }}
	restore-keys: \|
	${{ runner.os }}-gatsby-build-

	- name: 📥 Install dependencies
	run: bun i --frozen-lockfile

	- name: 🛠️ Build with Gatsby
	run: bun run build

	- name: 📤 Deploy to gh-pages branch
	uses: peaceiris/actions-gh-pages@v4
	if: ${{ github.ref == 'refs/heads/main' }}
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: ./public
	cname: mergist.johng.io

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