chore(injections)!: update injection syntax to 0.9

Since 0.9, @lang syntax is still available as fallback but will soon be deprecated.
Because of that, new syntax should be adopted once 0.9 becomes the
baseline requirements for nvim-treesitter

- update health check
- update doc

queries/astro/injections.scm

@@ -1,19 +1,23 @@
-; inherits: html
+; inherits: html_tags
 
-((frontmatter
-    (raw_text) @typescript))
+(frontmatter
+  (raw_text) @injection.content
+  (#set! injection.language "typescript"))
 
-((interpolation
-    (raw_text) @tsx))
+(interpolation
+  (raw_text) @injection.content
+  (#set! injection.language "tsx"))
 
-((script_element
-    (raw_text) @typescript))
+(script_element
+  (raw_text) @injection.content
+  (#set! injection.language "typescript"))
 
-((style_element
-   (start_tag
-     (attribute
-       (attribute_name) @_lang_attr
-       (quoted_attribute_value (attribute_value) @_lang_value)))
-   (raw_text) @scss)
+(style_element
+ (start_tag
+   (attribute
+     (attribute_name) @_lang_attr
+     (quoted_attribute_value (attribute_value) @_lang_value)))
+ (raw_text) @injection.content
  (#eq? @_lang_attr "lang")
- (#eq? @_lang_value "scss"))
+ (#eq? @_lang_value "scss")
+ (#set! injection.language "scss"))