Add Fern docs platform: scaffolding, CI/CD, ecosystem diagram, and new pages #15

	# Generates a shareable Fern preview URL for every docs PR and posts it as a comment.
	# Requires the FERN_TOKEN repository secret.
	# Runs on pull_request events (internal contributors) and on push to pull-request/*
	# branches created by copy-pr-bot (external contributors), where secrets are accessible.
	name: Fern Docs Preview

	on:
	push:
	branches:
	- "pull-request/[0-9]+"
	pull_request:
	paths:
	- 'docs/**'
	- 'fern/**'
	- 'package.json'

	jobs:
	preview:
	name: Generate preview
	runs-on: ubuntu-latest
	permissions:
	pull-requests: write
	steps:
	- uses: actions/checkout@v4

	- uses: actions/setup-node@v4
	with:
	node-version: '20'

	- name: Install dependencies
	run: npm install

	- name: Generate preview
	id: preview
	run: \|
	output=$(npm run docs:preview 2>&1)
	echo "$output"
	url=$(echo "$output" \| grep -oP 'https://[^\s]+buildwithfern\.com[^\s]+' \| tail -1)
	echo "url=$url" >> "$GITHUB_OUTPUT"
	env:
	FERN_TOKEN: ${{ secrets.FERN_TOKEN }}

	- name: Post preview URL
	if: steps.preview.outputs.url != ''
	uses: actions/github-script@v7
	with:
	script: \|
	const prNumber = context.eventName === 'pull_request'
	? context.issue.number
	: parseInt(process.env.GITHUB_REF_NAME.split('/')[1]);
	github.rest.issues.createComment({
	issue_number: prNumber,
	owner: context.repo.owner,
	repo: context.repo.repo,
	body: `📖 Docs preview: ${{ steps.preview.outputs.url }}`
	})

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