fix: redirect docs homepage to getting-started guide, not marketing site

Homepage had a hardcoded JS redirect to platform9.com/vjailbreak
(copied verbatim from platform9/vjailbreak's own docs source), sending
every visitor straight to the marketing site instead of the docs.
Point it at the getting-started guide instead, using a relative path
so it resolves correctly under /vjailbreak-docs/ regardless of base.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

docs/src/content/docs/index.mdx

@@ -5,7 +5,7 @@ template: splash
 head:
   - tag: script
     content: |
-      window.location.href = 'https://platform9.com/vjailbreak/';
+      window.location.href = 'introduction/getting_started/';
 hero:
   tagline: Effortless Open-Source VMware to OpenStack Migration
   image: