`AlertDialog.confirm()` and `AlertDialog.alert()` open a small modal from
JavaScript and return a Promise. Options: `title`, `message`, `confirmText`,
`cancelText`, `variant`, `icon`, `align` and `focus`.
Also fixes `.modal-status` so the top bar follows the rounded corners, raises
the `tabler.js` size budget from 58 kB to 60 kB, and adds a docs page, a demo
page and a screenshot page.
Bartek
7118fa31ce