docs: update `content/learn/index.md` #90

	name: Textlint Lint

	on:
	push:
	branches:
	- main
	paths:
	- 'src/*/.md'
	- 'textlint/*/.js'
	- '.github/workflows/textlint_lint.yml'

	pull_request:
	types:
	- opened
	- synchronize
	- reopened
	paths:
	- 'src/*/.md'
	- 'textlint/*/.js'
	- '.github/workflows/textlint_lint.yml'

	jobs:
	Lint:
	runs-on: ubuntu-latest

	steps:
	- name: Set up checkout
	uses: actions/checkout@v4

	- name: Set up node
	uses: actions/setup-node@v4
	with:
	node-version: 20.x
	cache: yarn

	- name: Set up cache
	uses: actions/cache@v4
	with:
	path: ~/.yarn-cache
	key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}

	- name: Install dependencies
	run: yarn install --frozen-lockfile
	# The `--frozen-lockfile` flag in Yarn ensures that dependencies are installed without modifying the `yarn.lock` file. It is useful for maintaining consistency in CI/CD environments by preventing unexpected changes to the lock file and ensuring that the same versions of dependencies are installed.

	- name: Lint
	run: yarn textlint-lint

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