docs: update documentation URL (NVIDIA#174)

#### Overview

Update NeMo Relay documentation links and docs metadata to point to the NVIDIA-hosted documentation site.

- [x] I confirm this contribution is my own work, or I have the right to submit it under this project's license.
- [x] I searched existing issues and open pull requests, and this does not duplicate existing work.

#### Details

- Replaced GitHub Pages documentation references with `https://docs.nvidia.com/nemo/relay` in the top-level README, package READMEs, and OpenClaw integration README.
- Updated docs navigation text to use the NVIDIA NeMo Relay product name.
- Added the Fern docs beta announcement metadata.

Validation: not run; docs-only URL, navigation, and metadata updates.

#### Where should the reviewer start?

Start with `README.md` for the canonical documentation URL change, then `fern/docs.yml` for the docs-site metadata update.

#### Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

- Relates to: none




## Summary by CodeRabbit

* **Documentation**
  * Migrated all documentation references to the official NVIDIA documentation site for improved accessibility and centralized maintenance.
  * Enhanced documentation navigation structure and section titles for better organization.
  * Added beta software status announcement to the documentation portal.



[![Review Change Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/NVIDIA/NeMo-Relay/pull/174?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)

Authors:
  - Will Killian (https://github.com/willkill07)

Approvers:
  - https://github.com/mnajafian-nv

URL: NVIDIA#174

Author: willkill07

README.md

@@ -118,7 +118,7 @@ For source builds, testing, and contribution workflow, see [CONTRIBUTING.md](CON
 
 ## Documentation
 
-End-user documentation lives at [nvidia.github.io/NeMo-Relay](https://nvidia.github.io/NeMo-Relay/).
+End-user documentation lives at [docs.nvidia.com/nemo/relay](https://docs.nvidia.com/nemo/relay).
 
 The primary documentation track covers Rust, Python, and Node.js.
 

crates/adaptive/README.md

@@ -103,4 +103,4 @@ of the adaptive pipeline.
 
 ## Documentation
 
-NeMo Relay Documentation: https://nvidia.github.io/NeMo-Relay
+NeMo Relay Documentation: https://docs.nvidia.com/nemo/relay

crates/cli/README.md

@@ -132,4 +132,4 @@ output_directory = "./atif"
 
 ## Documentation
 
-NeMo Relay Documentation: https://nvidia.github.io/NeMo-Relay/
+NeMo Relay Documentation: https://docs.nvidia.com/nemo/relay

crates/core/README.md

@@ -113,4 +113,4 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
 ## Documentation
 
-NeMo Relay Documentation: https://nvidia.github.io/NeMo-Relay
+NeMo Relay Documentation: https://docs.nvidia.com/nemo/relay

crates/ffi/README.md

@@ -79,4 +79,4 @@ applications should prefer the supported packages for those languages.
 
 ## Documentation
 
-NeMo Relay Documentation: https://nvidia.github.io/NeMo-Relay
+NeMo Relay Documentation: https://docs.nvidia.com/nemo/relay

crates/node/README.md

@@ -95,4 +95,4 @@ are available at `nemo-relay-node/typed`, `nemo-relay-node/plugin`,
 
 ## Documentation
 
-NeMo Relay Documentation: https://nvidia.github.io/NeMo-Relay
+NeMo Relay Documentation: https://docs.nvidia.com/nemo/relay

crates/python/README.md

@@ -78,4 +78,4 @@ with nemo_relay.scope.scope("demo-agent", nemo_relay.ScopeType.Agent) as handle:
 
 ## Documentation
 
-NeMo Relay Documentation: https://nvidia.github.io/NeMo-Relay
+NeMo Relay Documentation: https://docs.nvidia.com/nemo/relay

crates/wasm/README.md

@@ -112,4 +112,4 @@ are available at `nemo-relay-wasm/typed`, `nemo-relay-wasm/plugin`,
 
 ## Documentation
 
-NeMo Relay Documentation: https://nvidia.github.io/NeMo-Relay
+NeMo Relay Documentation: https://docs.nvidia.com/nemo/relay

docs/about-nemo-relay/overview.mdx

@@ -9,7 +9,7 @@ import { MermaidStyles } from "@/components/MermaidStyles";
 SPDX-License-Identifier: Apache-2.0 */}
 
 
-NeMo Relay is a portable execution runtime for agent systems that already have a
+NVIDIA NeMo Relay is a portable execution runtime for agent systems that already have a
 framework, model provider, policy layer, or observability backend. It gives those
 systems one consistent way to describe what is happening when an agent crosses a
 request, tool, or LLM boundary.

docs/index.yml

@@ -3,15 +3,15 @@
 
 navigation:
   - folder: ./about-nemo-relay
-    title: "About NeMo Relay"
+    title: "About NVIDIA NeMo Relay"
     slug: about-nemo-relay
     title-source: frontmatter
   - folder: ./getting-started
     title: "Getting Started"
     slug: getting-started
     title-source: frontmatter
   - folder: ./nemo-relay-cli
-    title: "NeMo Relay CLI"
+    title: "NVIDIA NeMo Relay CLI"
     slug: nemo-relay-cli
     title-source: frontmatter
   - folder: ./supported-integrations