Migrate docs from Sphinx to MkDocs (#18145)

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

docs/getting_started/installation/cpu/arm.inc.md

@@ -0,0 +1,41 @@
+# --8<-- [start: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.
+
+!!! warning
+    There are no pre-built wheels or images for this device, so you must build vLLM from source.
+
+# --8<-- [end:installation]
+# --8<-- [start:requirements]
+
+- OS: Linux
+- Compiler: `gcc/g++ >= 12.3.0` (optional, recommended)
+- Instruction Set Architecture (ISA): NEON support is required
+
+# --8<-- [end:requirements]
+# --8<-- [start:set-up-using-python]
+
+# --8<-- [end:set-up-using-python]
+# --8<-- [start:pre-built-wheels]
+
+# --8<-- [end:pre-built-wheels]
+# --8<-- [start:build-wheel-from-source]
+
+--8<-- "docs/getting_started/installation/cpu/cpu/build.inc.md"
+
+Testing has been conducted on AWS Graviton3 instances for compatibility.
+
+# --8<-- [end:build-wheel-from-source]
+# --8<-- [start:set-up-using-docker]
+
+# --8<-- [end:set-up-using-docker]
+# --8<-- [start:pre-built-images]
+
+# --8<-- [end:pre-built-images]
+# --8<-- [start:build-image-from-source]
+
+# --8<-- [end:build-image-from-source]
+# --8<-- [start:extra-information]
+# --8<-- [end:extra-information]