docs: triage issues + revamp troubleshooting guides (#14216)

* docs: triage issues + revamp troubleshooting guides

* small change

www/apps/book/app/learn/installation/page.mdx

@@ -28,7 +28,7 @@ While this is the recommended way to create a Medusa application, you can altern
 
 <Prerequisites items={[
   {
-    text: "Node.js v20+ (LTS versions)",
+    text: "Node.js v20+ (LTS versions only)",
     link: "https://nodejs.org/en/download"
   },
   {
@@ -36,7 +36,7 @@ While this is the recommended way to create a Medusa application, you can altern
     link: "https://git-scm.com/downloads"
   },
   {
-    text: "PostgreSQL",
+    text: "PostgreSQL installed and running",
     link: "https://www.postgresql.org/download/"
   }
 ]} />