Rename .eslintrc to .eslintrc.json (#1481)

So it will be auto formatted on commits

.eslintrc.json

@@ -0,0 +1,30 @@
+{
+  "extends": ["prettier", "react-app"],
+  "plugins": ["prettier"],
+  "rules": {
+    "curly": "warn",
+    "no-console": [
+      "warn",
+      {
+        "allow": ["warn", "error", "info"]
+      }
+    ],
+    "no-else-return": "warn",
+    "no-useless-return": "warn",
+    "prefer-const": [
+      "warn",
+      {
+        "destructuring": "all"
+      }
+    ],
+    "prefer-template": "warn",
+    "prettier/prettier": "warn",
+    "no-restricted-syntax": [
+      "warn",
+      {
+        "selector": "JSXText[value=/\\w/]",
+        "message": "Use 't(...)' instead of literal text in JSX"
+      }
+    ]
+  }
+}