docs: added documentation for build command (#9604)

- Added documentation for `medusa build` command
- Update deployment documentation for admin to use `--admin-only` option

www/apps/resources/generated/sidebar.mjs

@@ -8098,6 +8098,14 @@ export const generatedSidebar = [
                 "title": "user",
                 "children": []
               },
+              {
+                "loaded": true,
+                "isPathHref": true,
+                "type": "link",
+                "path": "/medusa-cli/commands/build",
+                "title": "build",
+                "children": []
+              },
               {
                 "loaded": true,
                 "isPathHref": true,