Add topic "unist"

Author: shaedrich

topics/unist/index.md

@@ -0,0 +1,9 @@
+---
+display_name: Universal Syntax Tree.
+short_description: unist is a specification for syntax trees. It has a big ecosystem of utilities in JavaScript for working with these trees.
+topic: unist
+url: https://unifiedjs.com/
+repo_url: https://github.com/syntax-tree/unist
+related: ast, cst, syntax tree
+---
+unist is a specification for syntax trees. It has a big ecosystem of utilities in JavaScript for working with these trees. It’s implemented by several other specifications.