docs: improve getting started chapters (#10014)

www/apps/resources/app/deployment/admin/vercel/page.mdx

@@ -15,7 +15,7 @@ In this document, you’ll learn how to deploy the Medusa Admin to [Vercel](http
 <Prerequisites items={[
   {
     text: "Medusa application’s codebase hosted on GitHub repository.",
-    link: "!docs!"
+    link: "!docs!/learn/installation"
   },
   {
     text: "Deployed Medusa application.",

www/apps/resources/app/deployment/medusa-application/railway/page.mdx

@@ -31,7 +31,7 @@ The same Medusa project is used to deploy the server and worker modes. Learn mor
 <Prerequisites items={[
   {
     text: "Medusa application’s codebase hosted on GitHub repository.",
-    link: "!docs!"
+    link: "!docs!/learn/installation"
   },
 ]} />