fix(ruby): convert snippets from global to language-scoped

Convert Ruby language snippets from global snippets
to language-scoped (Ruby) to stop suggesting
them in unrelated languages like Rust.

See https://zed.dev/docs/snippets?highlight=snippet#snippets

Fixes #220

Author: vitallium

extension.toml

@@ -5,7 +5,7 @@ version = "0.16.1"
 schema_version = 1
 authors = ["Vitaly Slobodin <[email protected]>"]
 repository = "https://github.com/zed-extensions/ruby"
-snippets = "snippets.json"
+snippets = "./languages/ruby/ruby.json"
 
 [language_servers.solargraph]
 name = "Solargraph"