Improve support request details import form

Summary:
Created as standard layout that can be used for both the import and export form

Standardized components used, so that we work towards a Design Framework that is consistent. Took inspiration from some existing plugins.

Also fixed weird sidebar transparency.

Reviewed By: passy

Differential Revision: D18504078

fbshipit-source-id: 7649abf7aa3eba8ba635337a41274bba93738e81

src/ui/components/SmallText.tsx

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import styled from 'react-emotion';
+import {colors} from './colors';
+import Text from './Text';
+
+/**
+ * Subtle text that should not draw attention
+ */
+const SmallText = styled(Text)({
+  color: colors.light20,
+  size: 10,
+  fontStyle: 'italic',
+});
+SmallText.displayName = 'SmallText';
+
+export default SmallText;