Fix broken relative links in UD templates article (#21)

The Index section linked to `the-why` and `the-how` as relative pages,
which 404. Both target headings exist in the article and Hugo generates
`id="the-why"` / `id="the-how"`, so convert them to in-page anchors.

Closes #21

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: psjamesp

content/articles/2019-06-14-universal-dashboard-templates-scaffolding-a-new-ud-project-with-powershell.md

@@ -20,11 +20,11 @@ _All code from this article is freely available on Github as a template reposito
 
 
   - 
-    [What are the advantages of project scaffolding](the-why)
+    [What are the advantages of project scaffolding](#the-why)
 
 
   - 
-    [How does ud-template work](the-how)
+    [How does ud-template work](#the-how)