Add Astro Support (#6896)

Attempt to add `@astrojs/language-server` and
[virchau13/tree-sitter-astro](https://github.com/virchau13/tree-sitter-astro).

---------

Co-authored-by: Nate Butler <iamnbutler@gmail.com>

crates/zed/src/languages/tailwind.rs

@@ -114,6 +114,7 @@ impl LspAdapter for TailwindLspAdapter {
 
     fn language_ids(&self) -> HashMap<String, String> {
         HashMap::from_iter([
+            ("Astro".to_string(), "astro".to_string()),
             ("HTML".to_string(), "html".to_string()),
             ("CSS".to_string(), "css".to_string()),
             ("JavaScript".to_string(), "javascript".to_string()),