fix: remove playground link from js

Author: scr2em

.grit/patterns/js/no_implicit_coercion.md

@@ -4,7 +4,6 @@ tags: [good-practice]
 ---
 This matches the [eslint rule](https://eslint.org/docs/latest/rules/no-implicit-coercion).
 
-Check the [Playground](https://app.grit.io/studio?key=cle6qCCw_-XMW9Nxs-PKH)
 ```grit
 engine marzano(1.0)
 language js

.grit/patterns/js/object_shorthand.md

@@ -4,7 +4,6 @@ tags: [good-practice]
 ---
 This matches the [eslint rule](https://eslint.org/docs/latest/rules/object-shorthand).
 
-Check the [Playground](https://app.grit.io/studio?key=fsNvFDGI4px3u5p7VdAQZ)
 ```grit
 engine marzano(1.0)
 language js