Update assistant config UI (#15630)

![CleanShot 2024-08-01 at 12 55
01@2x](https://github.com/user-attachments/assets/f9ed44ba-6bff-4805-ad71-2e3538315e57)

- Remove assisstant_description for now.
- Updates assistant config UI
- Updates Ollama and zed.dev provider UIs
- Updates download icon

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/zed/src/main.rs

@@ -174,7 +174,12 @@ fn init_common(app_state: Arc<AppState>, cx: &mut AppContext) {
         cx,
     );
     supermaven::init(app_state.client.clone(), cx);
-    language_model::init(app_state.client.clone(), app_state.fs.clone(), cx);
+    language_model::init(
+        app_state.user_store.clone(),
+        app_state.client.clone(),
+        app_state.fs.clone(),
+        cx,
+    );
     snippet_provider::init(cx);
     inline_completion_registry::init(app_state.client.telemetry().clone(), cx);
     assistant::init(app_state.fs.clone(), app_state.client.clone(), cx);