Update prettier to latest. Remove tslint (#1641)

* Rev up prettier

* Reformat

* Remove deprecated tslint

* Remove call to tslint and update package-lock.json

src/Explorer/Quickstart/Shared/QuickstartRenderUtilities.tsx

@@ -31,7 +31,7 @@ export const customPivotHeaderRenderer = (
   link: IPivotItemProps,
   defaultRenderer: (link?: IPivotItemProps) => JSX.Element | null,
   currentStep: number,
-  newStep: number
+  newStep: number,
 ): JSX.Element | null => {
   if (!link || !defaultRenderer) {
     return null;