chore!: remove --env from llama stack run (#3711)

# What does this PR do?
user can simply set env vars in the beginning of the command.`FOO=BAR
llama stack run ...`

## Test Plan
Run
TELEMETRY_SINKS=coneol uv run --with llama-stack llama stack build
--distro=starter --image-type=venv --run




---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with
[ReviewStack](https://reviewstack.dev/llamastack/llama-stack/pull/3711).
* #3714
* __->__ #3711

docs/docs/getting_started/detailed_tutorial.mdx

@@ -86,9 +86,9 @@ docker run -it \
   --pull always \
   -p $LLAMA_STACK_PORT:$LLAMA_STACK_PORT \
   -v ~/.llama:/root/.llama \
+  -e OLLAMA_URL=http://host.docker.internal:11434 \
   llamastack/distribution-starter \
-  --port $LLAMA_STACK_PORT \
-  --env OLLAMA_URL=http://host.docker.internal:11434
+  --port $LLAMA_STACK_PORT
 ```
 Note to start the container with Podman, you can do the same but replace `docker` at the start of the command with
 `podman`. If you are using `podman` older than `4.7.0`, please also replace `host.docker.internal` in the `OLLAMA_URL`
@@ -106,9 +106,9 @@ docker run -it \
   -p $LLAMA_STACK_PORT:$LLAMA_STACK_PORT \
   -v ~/.llama:/root/.llama \
   --network=host \
+  -e OLLAMA_URL=http://localhost:11434 \
   llamastack/distribution-starter \
-  --port $LLAMA_STACK_PORT \
-  --env OLLAMA_URL=http://localhost:11434
+  --port $LLAMA_STACK_PORT
 ```
 :::
 You will see output like below: