Auto-generate distro yamls + docs (#468)

# What does this PR do?

Automatically generates
- build.yaml
- run.yaml
- run-with-safety.yaml
- parts of markdown docs

for the distributions.

## Test Plan

At this point, this only updates the YAMLs and the docs. Some testing
(especially with ollama and vllm) has been performed but needs to be
much more tested.

llama_stack/providers/remote/inference/together/config.py

@@ -4,7 +4,7 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
-from typing import Optional
+from typing import Any, Dict, Optional
 
 from llama_models.schema_utils import json_schema_type
 from pydantic import BaseModel, Field
@@ -20,3 +20,10 @@ class TogetherImplConfig(BaseModel):
         default=None,
         description="The Together AI API Key",
     )
+
+    @classmethod
+    def sample_run_config(cls) -> Dict[str, Any]:
+        return {
+            "url": "https://api.together.xyz/v1",
+            "api_key": "${env.TOGETHER_API_KEY}",
+        }