Reorganize docs: move Server below CLI, rename to Server, move SDKs below Server

- Move Server Setup from position 3 to position 15 (below CLI at position 14)
- Rename "Server Setup" to "Server" in title and heading
- Move SDKs from position 7 to position 16 (below Server)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: durable-workflow-ops

docs/sdks/_category_.json

@@ -1,6 +1,6 @@
 {
   "label": "SDKs",
-  "position": 7,
+  "position": 16,
   "link": {
     "type": "generated-index",
     "description": "Language SDKs for building workflows and activities outside of the PHP embedded package."

docs/server-setup.md

@@ -1,10 +1,10 @@
 ---
-sidebar_position: 3
-title: Server Setup
+sidebar_position: 15
+title: Server
 description: Deploy and configure the Durable Workflow standalone server.
 ---
 
-# Server Setup
+# Server
 
 The Durable Workflow server is a standalone, language-neutral workflow orchestration service. It exposes the same durable execution engine as the PHP package over HTTP, letting you write workflows in Python, PHP, or any language that speaks HTTP.