astro 0.22.15

#2371 85ad1aab Thanks @natemoo-re! - Add support for styled RSS feeds using the new stylesheet option
#2416 5208c88a Thanks @matthewp! - Adds Astro.resolve deprecation for the static build
#2392 24aa3245 Thanks @obnoxiousnerd! - Support markdown draft pages. Markdown draft pages are markdown pages which have draft set in their frontmatter. By default, these will not be built by Astro while running astro build. To disable this behavior, you need to set buildOptions.drafts to true or pass the --drafts flag while running astro build. An exaple of a markdown draft page is:
```
---
# src/pages/blog-post.md
title: My Blog Post
draft: true
---

This is my blog post which is currently incomplete.
```