Reverts some inadvertent markdown formatting changes and unnecessary eslint config entry.

.eslintrc.json

@@ -6,7 +6,6 @@
     "plugin:github/typescript"
   ],
   "globals": {
-    "CustomElementElement": "readonly",
-    "module": true
+    "CustomElementElement": "readonly"
   }
 }

README.md

@@ -5,7 +5,7 @@ A custom element that shows text as if it were being typed
 ## Installation
 
 ```
-npm install @github/typing-effect-element
+$ npm install @github/typing-effect-element
 ```
 
 ## Usage