[Docs] Clean up architecture docs: remove duplicates, fix stale content

[tlopex]

• Remove duplicate tvm/s_tir/meta_schedule and tvm/s_tir/dlight sections from arch/index.rst (already covered in the tvm/s_tir section with cross-reference to TensorIR Deep Dive)
• Remove duplicate device_target_interactions toctree entry (was listed under both tvm/runtime and tvm/target; keep only under tvm/target)
• Remove duplicate CUDA pipeline listing in arch/fusion.rst "How Backends Use Fusion" section (already shown in Overview); add cross-reference to BYOC doc
• Remove duplicated intro sentences in arch/relax_vm.rst that were identical to arch/index.rst
• Fix R.call_dps → R.call_dps_packed (the former does not exist)
• Replace outdated GraphExecutor example (set_input/run/get_output) with Relax VM example (GraphExecutor has been removed from the codebase)
• Replace broken external mlc.ai image link (returns 404) with local image in deep_dive/relax/learning.rst
• Fix stale use pass instrument link in arch/pass_infra.rst that pointed to an unrelated page

[gemini-code-assist]

Code Review

This pull request updates the TVM Relax documentation across several files to reflect current practices and improve clarity. Key changes include updating the end-to-end model execution example to use the Relax Virtual Machine, correcting references to low-level function calls, and cleaning up outdated sections and links. The review feedback suggests appending .numpy() to the VM execution result for consistency with previous examples and adding a missing link definition in the pass infrastructure documentation to prevent broken references.