Cleanups (#3742)

* Remove unused file

* Combine tx checks into single file

* Move UI components into UI

* DRY links

* Unused rollup config

* Cleanup util paths

* Revert "Move UI components into UI"

This reverts commit 3379e61246cde635c296d31322b71e63395a5cd4.

* Re-apply ~/util/tx move

* Cleanup unused styles

js/src/modals/SaveContract/saveContract.js

@@ -20,7 +20,7 @@ import SaveIcon from 'material-ui/svg-icons/content/save';
 import ContentClear from 'material-ui/svg-icons/content/clear';
 
 import { Button, Modal, Editor, Form, Input } from '~/ui';
-import { ERRORS, validateName } from '../../util/validation';
+import { ERRORS, validateName } from '~/util/validation';
 
 import styles from './saveContract.css';