refactor(workflows): generate workflow manager via HtmlWebpackPlugin

Change-Id: I50a6aba661bee2fabd634b6bf13d4a60459acc14
diff --git a/src/options/optionsCommon.js b/src/options/optionsCommon.js
index 6d41a39..246616a 100644
--- a/src/options/optionsCommon.js
+++ b/src/options/optionsCommon.js
@@ -172,7 +172,7 @@
     manageWorkflowsBtn.addEventListener('click', e => {
       e.preventDefault();
       chrome.tabs.create({
-        url: chrome.runtime.getURL('options/workflows.html'),
+        url: chrome.runtime.getURL('workflows.html'),
       })
     });