feat(languagetree): implement language tree

Allow the LanguageTree to be used as an option for highlighting.

Co-authored-by: Santos Gallegos <stsewd@protonmail.com>
Co-authored-by: Yazdani Kiyan <yazdani.kiyan@protonmail.com>

queries/markdown/highlights.scm

@@ -0,0 +1,19 @@
+(atx_heading) @text.title
+
+[
+  (code_span)
+  (fenced_code_block)
+]@text.literal
+
+(code_fence_content) @none
+
+[
+  (link_text)
+  (image_description)
+] @text.strong
+
+[
+  (emphasis)
+  (strong_emphasis)
+] @text.emphasis
+(link_destination) @text.uri

queries/markdown/injections.scm

@@ -0,0 +1,6 @@
+(fenced_code_block
+  (info_string) @lang
+  (code_fence_content) @injection)
+
+((html_block) @injection
+  (#set! "lang" "html"))