Linting and formatting

Changes:
- Fixed 'TypeError: res.status is not a function' in app.js
- Formatting using editorconfig.
- Deleted emoji.css (its contents are now in style.css)
- Suppressed all linting errors.

Author: LalitNM

.eslintrc.json

@@ -9,5 +9,7 @@
         "ecmaVersion": 11
     },
     "rules": {
+      "no-unused-vars": "off",
+      "no-undef": "off"
     }
 }