Scraping web pages from the command-line with shot-scraper

Here's a quick demo:

    % pip install shot-scraper
    % shot-scraper install
    % shot-scraper javascript https://datasette.io/ "({
        title: document.title,
        tagline: document.querySelector('.tagline').innerText
    })"
    {
        "title": "Datasette: An open source multi-tool for exploring and publishing data",
        "tagline": "An open source multi-tool for exploring and publishing data"
    }