docs: Improve homepage and getting started pages

- Enhanced homepage with Monarch foundation emphasis, technology stack highlights, validated examples, and clear navigation paths
- Expanded getting started with detailed dependency explanations (Monarch, vLLM, TorchTitan, TorchStore, PyTorch Nightly)
- Converted installation and verification steps to numbered lists for better readability
- Simplified concepts page (detailed architecture content will come in separate PR)
- Removed FAQ references as FAQ page has been removed
- Fixed GPU/process terminology in code examples

Author: AlannaBurke

docs/source/architecture.md

@@ -133,19 +133,9 @@ TorchForge has been validated in real-world deployments:
 - **CoreWeave**: Large-scale training runs on 512 H100 GPU clusters with smooth, efficient performance
 - **Scale**: Tested across hundreds of GPUs with continuous rollouts and asynchronous training
 
-## Learn More
+## See Also
 
-Dive deeper into specific topics:
-
-```{toctree}
-:maxdepth: 1
-
-architecture
-technology_stack
-rl_workflows
-```
-
-**Related Documentation:**
 - {doc}`getting_started` - Installation and first training run
 - {doc}`usage` - Practical configuration examples
+- {doc}`tutorials` - Step-by-step guides
 - {doc}`api` - Complete API reference