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/views/Contract/contract.js

@@ -124,7 +124,7 @@ class Contract extends Component {
     }
 
     return (
-      <div className={ styles.contract }>
+      <div>
         { this.renderActionbar(account) }
         { this.renderDeleteDialog(account) }
         { this.renderEditDialog(account) }