add login/sign-up page with dark/light mode

node_modules/eslint-plugin-jsx-a11y/__mocks__/LiteralMock.js

@@ -0,0 +1,17 @@
+/**
+ * @flow
+ */
+
+export type LiteralMockType = {|
+  type: 'Literal',
+  value: string,
+  raw: string,
+|};
+
+export default function LiteralMock(value: string): LiteralMockType {
+  return {
+    type: 'Literal',
+    value,
+    raw: value,
+  };
+}