af075d81 Thanks @natemoo-re! - Visual redesign of the astro dev CLI, including new astro --help and astro --version outputs.

These changes introduce a new startup screen, make it more obvious when a file triggers in-place HMR (update) or a full reload (reload), and improve the way Astro surfaces errors during dev.
#2747 05b66bd6 Thanks @natemoo-re! - Escape HTML inside of expressions by default. Please see our migration guide for more details.

#2695 ae8d9256 Thanks @natemoo-re! - Update Astro.slots API with new public has and render methods.

This is a backwards-compatible change—Astro.slots.default will still be true if the component has been passed a default slot.
```
if (Astro.slots.has('default')) {
    const content = await Astro.slots.render('default');
}
```
#2705 72c2c86e Thanks @natemoo-re! - Fixes the static build to write to 404.html
#2737 e8d4e568 Thanks @natemoo-re! - Astro's logger has been redesigned for an improved experience! In addition to deduping identical messages, we've surfaced more error details and exposed new events like update (for in-place HMR) and reload (for full-reload HMR).
#2733 6bf124fb Thanks @FredKSchott! - Remove a bad dev warning
#2732 0ae96bb7 Thanks @bholmesdev! - Update server start message to use localhost for local hostnames