Docs/flow selection and cleanup

[poganesh]

This PR improves navigability and consistency of the Ryzen AI Software docs, focused on helping users pick the right flow.

Flow selection (new)

• Landing page now has a "Choose Your Flow" decision table, a "Will My Processor Work?" hardware-support matrix, and a glossary (flow / execution mode / Lemonade / OGA / VitisAI EP / NPU-vs-IPU / codenames).
• New "Choosing Between Overlapping Flows" section documents the overlaps explicitly: Lemonade vs. Foundry Local vs. Windows ML for LLMs, and native VitisAI EP flow vs. Windows ML vs. DirectML for CNN/Transformer models.

Model list consolidation

• Made llm_list.rst the single canonical "Supported LLMs" page, wired into the nav; removed the duplicate/divergent model_list.rst.

Terminology

• Reframed "Token Fusion / Full Fusion" as use-case-led ("Long-context / High-throughput"), keeping the recipe names and --token_fusion/--full_fusion CLI flags intact.

Cleanups

• Removed stale hybrid_oga_pip_install_draft.rst.
• Fixed broken "OGA C++ Headers" link in the landing-page stack table.
• Renamed the duplicate install-driver Sphinx label on the Linux page (install-driver-linux).
• Fixed version string 1.7.0 → 1.7.1 in ops_support.rst.

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