feat: consolidate most distros into "starter" (#2516)

# What does this PR do?

* Removes a bunch of distros
* Removed distros were added into the "starter" distribution
* Doc for "starter" has been added
* Partially reverts https://github.com/meta-llama/llama-stack/pull/2482
  since inference providers are disabled by default and can be turned on
  manually via env variable.
* Disables safety in starter distro

Closes: https://github.com/meta-llama/llama-stack/issues/2502.

~Needs: https://github.com/meta-llama/llama-stack/pull/2482 for Ollama
to work properly in the CI.~

TODO:

- [ ] We can only update `install.sh` when we get a new release.
- [x] Update providers documentation
- [ ] Update notebooks to reference starter instead of ollama

Signed-off-by: Sébastien Han <seb@redhat.com>

docs/source/providers/inference/remote_ollama.md

@@ -9,13 +9,11 @@ Ollama inference provider for running local models through the Ollama runtime.
 | Field | Type | Required | Default | Description |
 |-------|------|----------|---------|-------------|
 | `url` | `<class 'str'>` | No | http://localhost:11434 |  |
-| `raise_on_connect_error` | `<class 'bool'>` | No | True |  |
 
 ## Sample Configuration
 
 ```yaml
 url: ${env.OLLAMA_URL:=http://localhost:11434}
-raise_on_connect_error: true
 
 ```
 

docs/source/providers/inference/remote_runpod.md

@@ -15,7 +15,7 @@ RunPod inference provider for running models on RunPod's cloud GPU platform.
 
 ```yaml
 url: ${env.RUNPOD_URL:=}
-api_token: ${env.RUNPOD_API_TOKEN:=}
+api_token: ${env.RUNPOD_API_TOKEN}
 
 ```
 

docs/source/providers/inference/remote_together.md

@@ -15,7 +15,7 @@ Together AI inference provider for open-source models and collaborative AI devel
 
 ```yaml
 url: https://api.together.xyz/v1
-api_key: ${env.TOGETHER_API_KEY:=}
+api_key: ${env.TOGETHER_API_KEY}
 
 ```