microsite-next: redirects for new index pages + fix links

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

docs/features/techdocs/cli.md

@@ -8,7 +8,7 @@ description: TechDocs CLI - a utility command line interface for managing TechDo
 Utility command line interface for managing TechDocs sites in
 [Backstage](https://github.com/backstage/backstage).
 
-https://backstage.io/docs/features/techdocs/techdocs-overview
+https://backstage.io/docs/features/techdocs/
 
 ## Features
 

docs/features/techdocs/how-to-guides.md

@@ -433,7 +433,7 @@ const app = createApp({
 
 ## How to add the documentation setup to your software templates
 
-[Software Templates](https://backstage.io/docs/features/software-templates/software-templates-index)
+[Software Templates](https://backstage.io/docs/features/software-templates/)
 in Backstage is a tool that can help your users to create new components out of
 already configured templates. It comes with a set of default templates to use,
 but you can also