add advent of svelte blog post (#904)

tidy up

Author: Rich-Harris

apps/svelte.dev/content/blog/2024-12-01-advent-of-svelte.md

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+---
+title: Advent of Svelte
+description: Twenty-four days, twenty-four features
+author: The Svelte team
+authorURL: https://svelte.dev/
+pinnedUntil: 2024-12-26
+---
+
+Last December, [Svelte Society](https://bsky.app/profile/sveltesociety.dev) presented an advent calendar's worth of [festive Svelte-themed code challenges](https://advent.sveltesociety.dev/).
+
+This year, we're turning it around: you get to relax while _we_ take on a challenge. We've set ourselves a goal of releasing one thing a day from here until Christmas, whether it's a new feature in Svelte or SvelteKit or an improvement to the website.
+
+Follow [@svelte.dev](https://bsky.app/profile/svelte.dev) and [@sveltesociety.dev](https://bsky.app/profile/sveltesociety.dev) and check back every day to see what we've been cooking up.
+
+## Day 1: Error boundaries
+
+This is a long-awaited and much-requested feature, that allows you to isolate and recover from errors that occur during rendering. See the [docs](/docs/svelte/svelte-boundary) and [tutorial](/tutorial/svelte/svelte-boundary) for more.
+
+## Day 2
+
+Coming soon!
+
+## Day 3
+
+Coming soon!
+
+## Day 4
+
+Coming soon!
+
+## Day 5
+
+Coming soon!
+
+## Day 6
+
+Coming soon!
+
+## Day 7
+
+Coming soon!
+
+## Day 8
+
+Coming soon!
+
+## Day 9
+
+Coming soon!
+
+## Day 10
+
+Coming soon!
+
+## Day 11
+
+Coming soon!
+
+## Day 12
+
+Coming soon!
+
+## Day 13
+
+Coming soon!
+
+## Day 14
+
+Coming soon!
+
+## Day 15
+
+Coming soon!
+
+## Day 16
+
+Coming soon!
+
+## Day 17
+
+Coming soon!
+
+## Day 18
+
+Coming soon!
+
+## Day 19
+
+Coming soon!
+
+## Day 20
+
+Coming soon!
+
+## Day 21
+
+Coming soon!
+
+## Day 22
+
+Coming soon!
+
+## Day 23
+
+Coming soon!
+
+## Day 24
+
+Coming soon!