docs: Describe contract nonce. Changed title to Contract classes and instances in contract-classes.adoc #143

	name: Delete pull request preview workflow
	on:
	pull_request:
	types:
	- closed

	jobs:
	delete-site-preview:
	name: Delete Site Preview
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2
	with:
	node-version: 16
	ref: gh-pages
	USER_TOKEN: ${{ secrets.USER_TOKEN }}
	- name: Fetch all branches
	run: git fetch --all
	- name: Identify and remove preview build directory
	run: \|
	PR_ID=pr-${{ github.event.pull_request.number }}
	PREVIEW_PATH=${PR_ID}
	git checkout gh-pages
	if [ -d $PREVIEW_PATH ]; then
	rm -rf $PREVIEW_PATH
	git config user.name "GitHub Actions"
	git config user.email noreply@github.com
	git add .
	git commit -m "Delete preview build for PR $PR_ID after merging to master"
	git push origin gh-pages
	fi
	env:
	USER_TOKEN: "${{ secrets.USER_TOKEN }}"

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