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

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

docs/source/getting_started/installation/cpu/apple.inc.md

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+# Installation
+
+vLLM has experimental support for macOS with Apple silicon. For now, users shall build from the source vLLM to natively run on macOS.
+
+Currently the CPU implementation for macOS supports FP32 and FP16 datatypes.
+
+## Requirements
+
+- OS: `macOS Sonoma` or later
+- SDK: `XCode 15.4` or later with Command Line Tools
+- Compiler: `Apple Clang >= 15.0.0`
+
+## Set up using Python
+
+### Pre-built wheels
+
+### Build wheel from source
+
+After installation of XCode and the Command Line Tools, which include Apple Clang, execute the following commands to build and install vLLM from the source.
+
+```console
+git clone https://github.com/vllm-project/vllm.git
+cd vllm
+pip install -r requirements-cpu.txt
+pip install -e . 
+```
+
+```{note}
+On macOS the `VLLM_TARGET_DEVICE` is automatically set to `cpu`, which currently is the only supported device.
+```
+
+#### Troubleshooting
+
+If the build has error like the following snippet where standard C++ headers cannot be found, try to remove and reinstall your
+[Command Line Tools for Xcode](https://developer.apple.com/download/all/).
+
+```text
+[...] fatal error: 'map' file not found
+          1 | #include <map>
+            |          ^~~~~
+      1 error generated.
+      [2/8] Building CXX object CMakeFiles/_C.dir/csrc/cpu/pos_encoding.cpp.o
+
+[...] fatal error: 'cstddef' file not found
+         10 | #include <cstddef>
+            |          ^~~~~~~~~
+      1 error generated.
+```
+
+## Set up using Docker
+
+### Pre-built images
+
+### Build image from source
+
+## Extra information