To build:

npx eleventy

Or build and host locally for local development

npx eleventy --serve

Make an image:

cwebp.exe -q 60 -resize 800 0 input.jpeg -o \github\blog\img\output.webp

Default header is

title: REPLACE ME
permalink: REPLACE-ME/index.html
description: 
date: 2099-01-21
tags:
 - sample
layout: layouts/post.njk
eleventyExcludeFromCollections: true