Merge pull request #2865 from jasonrandrews/review2

update for asct install guide

Author: jasonrandrews

themes/arm-design-system-hugo-theme/layouts/robots.txt

@@ -1,5 +1,6 @@
 User-agent: *
 Disallow: /install-guides/atp/
+Disallow: /install-guides/asct/
 
 # Explicitly welcome AI crawlers
 User-agent: GPTBot
@@ -24,4 +25,4 @@ User-agent: CCBot
 Allow: /
 
 # Sitemap for page discovery
-Sitemap: https://learn.arm.com/sitemap.xml
+Sitemap: https://learn.arm.com/sitemap.xml