chore: rename templates to distributions (#3035)

As the title says. Distributions is in, Templates is out.

`llama stack build --template` --> `llama stack build --distro`. For
backward compatibility, the previous option is kept but results in a
warning.

Updated `server.py` to remove the "config_or_template" backward
compatibility since it has been a couple releases since that change.

docs/notebooks/Alpha_Llama_Stack_Post_Training.ipynb

@@ -37,7 +37,7 @@
         "\n",
         "To learn more about torchtune: https://github.com/pytorch/torchtune\n",
         "\n",
-        "We will use [experimental-post-training](https://github.com/meta-llama/llama-stack/tree/main/llama_stack/templates/experimental-post-training) as the distribution template\n",
+        "We will use [experimental-post-training](https://github.com/meta-llama/llama-stack/tree/main/llama_stack/distributions/experimental-post-training) as the distribution template\n",
         "\n",
         "####  0.0. Prerequisite: Have an OpenAI API key\n",
         "In this showcase, we will use [braintrust](https://www.braintrust.dev/) as scoring provider for eval and it uses OpenAI model as judge model for scoring. So, you need to get an API key from [OpenAI developer platform](https://platform.openai.com/docs/overview).\n",
@@ -2864,7 +2864,7 @@
         }
       ],
       "source": [
-        "!llama stack build --template experimental-post-training --image-type venv --image-name __system__"
+        "!llama stack build --distro experimental-post-training --image-type venv --image-name __system__"
       ]
     },
     {

docs/notebooks/Llama_Stack_Agent_Workflows.ipynb

@@ -38,7 +38,7 @@
    "source": [
     "# NBVAL_SKIP\n",
     "!pip install -U llama-stack\n",
-    "!UV_SYSTEM_PYTHON=1 llama stack build --template fireworks --image-type venv"
+    "!UV_SYSTEM_PYTHON=1 llama stack build --distro fireworks --image-type venv"
    ]
   },
   {

docs/notebooks/Llama_Stack_Benchmark_Evals.ipynb

@@ -57,7 +57,7 @@
       "outputs": [],
       "source": [
         "# NBVAL_SKIP\n",
-        "!UV_SYSTEM_PYTHON=1 llama stack build --template together --image-type venv"
+        "!UV_SYSTEM_PYTHON=1 llama stack build --distro together --image-type venv"
       ]
     },
     {

docs/notebooks/nvidia/beginner_e2e/Llama_Stack_NVIDIA_E2E_Flow.ipynb

@@ -92,7 +92,7 @@
    "metadata": {},
    "source": [
     "```bash\n",
-    "LLAMA_STACK_DIR=$(pwd) llama stack build --template nvidia --image-type venv\n",
+    "LLAMA_STACK_DIR=$(pwd) llama stack build --distro nvidia --image-type venv\n",
     "```"
    ]
   },

docs/notebooks/nvidia/tool_calling/1_data_preparation.ipynb

@@ -81,7 +81,7 @@
    "metadata": {},
    "source": [
     "```bash\n",
-    "LLAMA_STACK_DIR=$(pwd) llama stack build --template nvidia --image-type venv\n",
+    "LLAMA_STACK_DIR=$(pwd) llama stack build --distro nvidia --image-type venv\n",
     "```"
    ]
   },