fetch favicons

fetchIconUrls.js

```javascript
async function fetchIconUrls(url) {
  console.info(`fetching icon for ${url} manually`);
  const response = await fetch(url);
  const text = await response.text();
  const parser = new DOMParser();
  const doc = parser.parseFromString(text, "text/html");
  const iconLinks = doc.querySelectorAll("link[rel~=icon]");

  const retVal = [...iconLinks].map(iconLink => {
    const iconUrlString = iconLink.getAttribute("href");
    const iconUrl = new URL(iconUrlString, url);
    const iconHref = iconUrl.href;
    return iconHref;
  });

  return retVal;
}
```