[Doc] Organise installation documentation into categories and tabs (#11935)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

docs/source/deployment/docker.md

@@ -2,6 +2,8 @@
 
 # Using Docker
 
+(deployment-docker-pre-built-image)=
+
 ## Use vLLM's Official Docker Image
 
 vLLM offers an official Docker image for deployment.
@@ -23,6 +25,8 @@ container to access the host's shared memory. vLLM uses PyTorch, which uses shar
 memory to share data between processes under the hood, particularly for tensor parallel inference.
 ```
 
+(deployment-docker-build-image-from-source)=
+
 ## Building vLLM's Docker Image from Source
 
 You can build and run vLLM from source via the provided <gh-file:Dockerfile>. To build vLLM: