Dockerize application and add integration tests

[aequitas]

Getting started documentation on setting up a developer environment and integration tests: https://github.com/internetstandards/Internet.nl/blob/docker/documentation/Docker-getting-started.md

Other documents can be found at: https://github.com/internetstandards/Internet.nl/blob/docker/documentation/Docker.md

Collective todo:

• Test the setup with a production size dataset

Edit: to 'fix' the hundreds hidden items, Load more… a poor man's solution is this js:

function loadAllComments() {
    let needRescheduling = false;
    const buttons = Array.from(document.querySelectorAll('button'));
    buttons.forEach((button) => {
        if (button.classList.contains('ajax-pagination-btn')) {
            if(!button.hasAttribute('disabled') && button.innerText === 'Load more…') {
                console.log("found", button);
                needRescheduling = true;
                button.dispatchEvent(new MouseEvent('click', {
                    bubbles: true,
                    cancelable: true
                }));                
            }
            else if(button.hasAttribute('disabled') && button.innerText === 'Loading…') {
                console.log("waiting", button);
                needRescheduling = true;
            }
            else {
                console.log("unrecognized 'Load more' button", button);
            }
        }
    });
    if (needRescheduling) {
        setTimeout(loadAllComments, 200)
    }
    else {
        console.log("all comments loaded");
    }
}

loadAllComments();