fix validation errors #29

	name: github pages

	on:
	push:
	branches:
	- main
	- master

	jobs:
	html5validate:
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0

	- name: Setup Python
	uses: actions/setup-python@v2
	with:
	python-version: '3.8'

	- name: Install dependencies
	run: pip install html5validator

	- name: Validate
	run: html5validator --root .

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