Revise sidebar links and structure for toolkit documentation

Author: lvlindv

docs/wiki/_Sidebar.md

@@ -1,8 +1,19 @@
 # Wiki content
+- [Introduction](./Introduction-to-Azure-Region-Selection-Toolkit)
 
-- [What is Regions selection toolkit](./Home)
-- [How to use Region Seleciton Toolkit](./ToolkitHowTo)
-- [Frequently Asked Questions](./FAQ)
-- [Contributing](./Contribution)
+## Toolkit Usage
+- [Getting Started](./Setup-and-Prerequisites)
+- [Step by Step Guide](./Step-by-Step-Guide)
+
+## Reference
+- [What's New?](./WhatsNew)
+- [FAQ](./FAQ)
 - [Known Issues](./KnownIssues)
-- [Telemetry](./Telemetry)
+- [Telemetry](./Telemetry)
+- [Contributing](./Contribution)
+
+## Scripts
+- [1-Collect](./1-Collect)
+- [2-AvailabilityCheck](./2-AvailabilityCheck)
+- [3-CostInformation](./3-CostInformation)
+- [7-Report](./7-Report)