feat(copilot-docs): update readme and docs with local hosting instructions (#1043)

* Docs

* Lint

README.md

@@ -160,6 +160,7 @@ Copilot is a Sim-managed service. To use Copilot on a self-hosted instance:
 
 - Go to https://sim.ai → Settings → Copilot and generate a Copilot API key
 - Set `COPILOT_API_KEY` in your self-hosted environment to that value
+- Host Sim on a publicly available DNS and set NEXT_PUBLIC_APP_URL and BETTER_AUTH_URL to that value ([ngrok](https://ngrok.com/))
 
 ## Tech Stack
 

apps/docs/content/docs/copilot/index.mdx

@@ -16,7 +16,10 @@ Copilot is your in-editor assistant that helps you build, understand, and improv
 - **Edit**: Make changes to blocks, connections, and settings when you approve
 
 <Callout type="info">
-  Copilot is a Sim-managed service. For self-hosted deployments, generate a Copilot API key in the hosted app (sim.ai → Settings → Copilot) and set `COPILOT_API_KEY` in your environment.
+  Copilot is a Sim-managed service. For self-hosted deployments, generate a Copilot API key in the hosted app (sim.ai → Settings → Copilot)
+  1. Go to [sim.ai](https://sim.ai) → Settings → Copilot and generate a Copilot API key
+2. Set `COPILOT_API_KEY` in your self-hosted environment to that value
+3. Host Sim on a publicly available DNS and set `NEXT_PUBLIC_APP_URL` and `BETTER_AUTH_URL` to that value (e.g., using ngrok)
 </Callout>
 
 ## Modes

apps/sim/next.config.ts

@@ -31,6 +31,10 @@ const nextConfig: NextConfig = {
         protocol: 'https',
         hostname: '*.s3.*.amazonaws.com',
       },
+      {
+        protocol: 'https',
+        hostname: 'lh3.googleusercontent.com',
+      },
       // Custom domain for file storage if configured
       ...(env.NEXT_PUBLIC_BLOB_BASE_URL
         ? [