docs: changes to deployment + remove admin deployment guides (#10345)

* docs: change headings and text in deployment

* remove admin deployment guide

* generate changes

www/apps/resources/generated/sidebar.mjs

@@ -9150,7 +9150,7 @@ export const generatedSidebar = [
             "loaded": true,
             "isPathHref": true,
             "type": "category",
-            "title": "Medusa Application",
+            "title": "Self-Hosting",
             "children": [
               {
                 "loaded": true,
@@ -9170,23 +9170,6 @@ export const generatedSidebar = [
               }
             ]
           },
-          {
-            "loaded": true,
-            "isPathHref": true,
-            "type": "category",
-            "title": "Medusa Admin",
-            "autogenerate_path": "/deployment/admin",
-            "children": [
-              {
-                "loaded": true,
-                "isPathHref": true,
-                "type": "link",
-                "path": "/deployment/admin/vercel",
-                "title": "Vercel",
-                "children": []
-              }
-            ]
-          },
           {
             "loaded": true,
             "isPathHref": true,