add chapter navigation, add custom `rehypeAutoHeading` #24

	# name: simple-app run build
	# on:
	# push:
	# branches: [master]
	# pull_request:
	# branches: [master]
	# jobs:
	# build:
	# runs-on: ubuntu-22.04
	# strategy:
	# matrix:
	# node-version: [20]

	# steps:
	# - uses: actions/checkout@v4
	# - name: Install pnpm
	# uses: pnpm/action-setup@v4
	# with:
	# version: 9
	# - name: Use Node.js ${{ matrix.node-version }}
	# uses: actions/setup-node@v4
	# with:
	# node-version: ${{ matrix.node-version }}
	# cache: 'pnpm'
	# - name: Install dependencies
	# run: pnpm install
	# - name: build production project
	# run: pnpm run build
	# if: always()

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