[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/build.inc.md

@@ -0,0 +1,21 @@
+First, install recommended compiler. We recommend to use `gcc/g++ >= 12.3.0` as the default compiler to avoid potential problems. For example, on Ubuntu 22.4, you can run:
+
+```console
+sudo apt-get update  -y
+sudo apt-get install -y gcc-12 g++-12 libnuma-dev
+sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 10 --slave /usr/bin/g++ g++ /usr/bin/g++-12
+```
+
+Second, install Python packages for vLLM CPU backend building:
+
+```console
+pip install --upgrade pip
+pip install cmake>=3.26 wheel packaging ninja "setuptools-scm>=8" numpy
+pip install -v -r requirements-cpu.txt --extra-index-url https://download.pytorch.org/whl/cpu
+```
+
+Finally, build and install vLLM CPU backend:
+
+```console
+VLLM_TARGET_DEVICE=cpu python setup.py install
+```