docs: Consolidate backend setup docs into local-collaboration.md (#34653)

Simplify docs for mac/linux/windows by consolidating the backend
dependencies (collaboration) docs into local-collaboration.md. Most
users building zed will not need to do this -- streamline them into
getting setup to build the zed client app first.

Release Notes:

- N/A

docs/src/development/macos.md

@@ -31,6 +31,10 @@ Clone down the [Zed repository](https://github.com/zed-industries/zed).
   brew install cmake
   ```
 
+### Backend Dependencies (optional) {#backend-dependencies}
+
+If you are looking to develop Zed collaboration features using a local collabortation server, please see: [Local Collaboration](./local-collaboration.md) docs.
+
 ## Building Zed from Source
 
 Once you have the dependencies installed, you can build Zed using [Cargo](https://doc.rust-lang.org/cargo/).
@@ -53,25 +57,6 @@ And to run the tests:
 cargo test --workspace
 ```
 
-## Backend Dependencies
-
-If you are developing collaborative features of Zed, you'll need to install the dependencies of zed's `collab` server:
-
-- Install [Postgres](https://postgresapp.com)
-- Install [Livekit](https://formulae.brew.sh/formula/livekit) and [Foreman](https://formulae.brew.sh/formula/foreman)
-
-  ```sh
-  brew install livekit foreman
-  ```
-
-- Follow the steps in the [collab README](https://github.com/zed-industries/zed/blob/main/crates/collab/README.md) to configure the Postgres database for integration tests
-
-Alternatively, if you have [Docker](https://www.docker.com/) installed you can bring up all the `collab` dependencies using Docker Compose:
-
-```sh
-docker compose up -d
-```
-
 ## Troubleshooting
 
 ### Error compiling metal shaders