docs(ai): improve subsection titles and discovery text

This commit improves the subsection titles and Discovery text.

.gitignore

@@ -1,2 +1,6 @@
 node_modules
-.DS_Store
+.DS_Store
+
+# IDE
+.vscode
+*.code-workspace

ai/introduction.mdx

@@ -1,5 +1,5 @@
 ---
-title: What is the Livepeer AI?
+title: What is the AI Subnet?
 icon: microchip-ai
 iconType: regular
 ---

ai/orchestrator/onchain.mdx

@@ -1,5 +1,5 @@
 ---
-title: On-chain configuration
+title: On-chain Configuration
 ---
 
 In the previous section we covered the **off-chain** configuration of the AI Orchestrator node. In this section, we will cover how to connect your AI Orchestrator node to the AI subnet and earn fees for processing AI inference jobs.
@@ -51,4 +51,4 @@ To make your *AI Orchestrator* discoverable by *AI Gateway* nodes on the AI subn
     https://<PUBLIC_ORCH_IP_OR_URL>:<PUBLIC_ORCH_PORT>
     ```
 
-Great job! Your _AI Orchestrator_ is now visible to _AI Gateway_ nodes on the AI Subnet 🚀!
+Well done! Your _AI Orchestrator_ is now discoverable by _AI Gateway_ nodes and primed to execute AI inference tasks on the AI Subnet. Onwards! 🚀

ai/setup-gateway.mdx

@@ -1,8 +1,7 @@
 ---
-title: Setup AI Gateway
+title: Setup an AI Gateway
 icon: signal-stream
 iconType: solid
 ---
 
-
 <Info>Coming Soon</Info>

mint.json

@@ -515,13 +515,12 @@
       "pages": [
         "ai/introduction",
         {
-          "group": "AI Orchestrator",
+          "group": "Setup an AI Orchestrator",
           "icon": "robot",
           "iconType": "solid",
           "pages": [
             "ai/orchestrator/get_started",
             "ai/orchestrator/models_config",
-            "ai/orchestrator/offchain",
             "ai/orchestrator/onchain"
           ]
         },