Update SUMMARY

Author: sofietoft

15/umbraco-workflow/SUMMARY.md

@@ -1,6 +1,7 @@
 # Table of contents
 
 * [Umbraco Workflow Documentation](README.md)
+* [Legacy Documentation](legacy-documentation.md)
 * [Release notes](release-notes.md)
 
 ## Installation
@@ -12,14 +13,26 @@
 
 * [Upgrading Umbraco Workflow](upgrading/upgrading.md)
 * [Version Specific Upgrade Notes](upgrading/version-specific.md)
+* [Migrate from Plumber to Workflow](upgrading/migrating-workflow.md)
 
 ## Getting Started
 
 * [Dashboards and Buttons](getting-started/dashboards-and-buttons.md)
+* [Submitting Content for Approval](getting-started/submitting-changes.md)
+* [Content App](getting-started/workflow-content-app.md)
+* [Notifications](getting-started/notifications.md)
+* [Configuration](getting-started/configuration.md)
+* [Approval thresholds](getting-started/approval-thresholds.md)
+* [History Cleanup](getting-started/history-cleanup.md)
 
 ## Workflow Section
 
 * [Workflow Section](workflow-section/workflow-section-dashboard.md)
+* [Active Workflows](workflow-section/active-workflows.md)
+* [Approval Groups](workflow-section/approval-groups.md)
+* [Content Reviews](workflow-section/content-reviews.md)
+* [Workflow History](workflow-section/workflow-history.md)
+* [Workflow Settings](workflow-section/workflow-settings.md)
 
 ## Advanced Search