[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/arm.inc.md

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+# Installation
+
+vLLM has been adapted to work on ARM64 CPUs with NEON support, leveraging the CPU backend initially developed for the x86 platform.
+
+ARM CPU backend currently supports Float32, FP16 and BFloat16 datatypes.
+
+## Requirements
+
+- OS: Linux
+- Compiler: `gcc/g++ >= 12.3.0` (optional, recommended)
+- Instruction Set Architecture (ISA): NEON support is required
+
+## Set up using Python
+
+### Pre-built wheels
+
+### Build wheel from source
+
+:::{include} build.inc.md
+:::
+
+Testing has been conducted on AWS Graviton3 instances for compatibility.
+
+## Set up using Docker
+
+### Pre-built images
+
+### Build image from source
+
+## Extra information