Refresh compile/run examples in deployment configuration guides.

[ScottTodd]

Progress on #18174, updating some stale documentation.

Note

Demo here: https://scotttodd.github.io/iree/guides/deployment-configurations/cpu/

Changes included:

• Switch examples to use ONNX instead of TensorFlow given that users are trying to use TensorFlow and failing: Compiling mobilenetV2 from ducumentation: "failed to legalize operation 'stablehlo.convolution' that was explicitly marked illegal" #19852
• Add more documentation for CPU targets and features for Compiling for llvm-cpu without targeting a specific CPU is a bad experience #18561
• Standardize some formatting across CPU/CUDA/ROCm/Vulkan pages
• Adjust some parts of the ONNX guide now that support is more mature