doc: Modernize documentation, platforms, algorithms, architecture, and binary releases - #522

- Move full system & software architecture, hostless architecture (with
  Bluetooth A2DP/HFP/LC3/Auracast endpoints), pipeline DAG, firmware
  subsystems, and topology architecture to architectures/index.rst.
- Move SDK development workflow diagram and core SDK ingredients to
  getting_started/index.rst with balanced 3-column layout.
- Add cross-references to main architecture hub from firmware and host index pages.
- Streamline introduction/index.rst with sof-waveform artwork, move Project
  Mission above offload benefits, and link out to dedicated hubs.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

- Extract FAQ into dedicated top-level portal (faq/index.rst)
- Update architecture index with Zephyr RTOS foundation and relocate memory hierarchy
- Rewrite Getting Started Build SOF section from scratch using sdk-install.sh
- Add OS tabs for Ubuntu/Debian and Fedora/RHEL system dependencies
- Add sphinx-copybutton extension for one-click command copying
- Remove legacy getting_started/build-guide subpages and update cross-references
- Update requirements.txt and requirements-lax.txt with modern documentation dependencies

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

…rk mode

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

…structions

- Mark Zephyr SDK toolchain as mandatory (Step 3).
- Update open-source Xtensa compiler instructions to use lgirdwood/llvm-project fork (llvm-stable branch) with compiler-rt builtins and WIP branches.
- Remove Step 7 (LLEXT build) from the main getting started page.
- Move kernel build environment setup directly into getting_started/index.rst while preserving the prepare-build-environment anchor.
- Update cross-references in install_locally.rst and setup_ktest_environment.rst.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

…er guides

- Rename firmware build section to 'Build and Install SOF Firmware'.
- Remove intermediate 'Set up SOF on a Linux machine' section.
- Create unified 'Build and Install SOF Linux Drivers' section integrating local kernel build, configuration, compilation, local install, verification, rebuild, and removal instructions directly.
- Move the 4 specialized platform/debug sections (special devices, Intel debug, NXP, LMDK) from getting started to developer guides.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

- Relocate setup_ktest_environment.rst to developer_guides/ktest/.
- Add 'Remote Deployment with ktest' section to developer_guides/index.rst.
- Replace ktest toctree in getting_started/index.rst with an inline note linking to the developer guide.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

…feedback

- Add high-level firmware architecture Graphviz diagram partitioned into
  SOF Application Layer (modules, schedulers, IPC, memory, endpoints)
  and Zephyr RTOS Layer (HAL drivers, kernel core, timers, logging, PM).
- Update architecture intro phrasing from 'is architected' to 'is designed'.
- Remove personal name from Xtensa LLVM/Clang development fork reference.
- Add concluding 'Next Steps' section linking to architectures, algorithms,
  developer guides, and platform matrix.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

…icon

- Vertically align SOF Application Layer and Zephyr RTOS Layer clusters
  in the high-level firmware architecture diagram so that outer boundaries
  and internal columns are balanced with straight-down inter-layer arrows.
- Replace low-contrast favicon with an adaptive SVG favicon supporting
  CSS @media (prefers-color-scheme: dark), switching between crisp white
  bars on dark browser tabs and navy bars on light browser tabs.
- Add dynamic theme observer in static/sof-custom.js to sync favicon
  with documentation theme toggle.
- Provide high-contrast PNG fallbacks with crisp white outline for 16x16
  and 32x32 resolutions.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

…pology sections

- Add Vendor column to supported platforms table with brand icons (Intel, AMD, NXP, MediaTek, PJRC / NXP, Espressif, Emulation).
- Slim primary navigation sidebar (13.5%, max 210px) and secondary TOC sidebar (11.5rem) to maximize central content reading width.
- Remove redundant Zephyr RTOS Foundation section from architecture overview.
- Relocate Audio Processing Pipelines (DAGs) under What is an SOF Topology? in Audio Topology Architecture.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

- Split shared platform rows in data/platforms.yaml so that each SoC has its own row (including Alder Lake variants, Raptor Lake variants, Arrow Lake variants, AMD Rembrandt/Phoenix/Strix, NXP i.MX8/i.MX9, and MediaTek MT8195/MT8186/MT8188/MT8196).
- Create data/legacy_platforms.yaml for platforms no longer supported in mainline, ensuring 1 SoC per row (Bay Trail, Merrifield, Cherry Trail, Braswell, Broadwell, Apollo Lake, Gemini Lake, Cannon Lake, Whiskey Lake, Comet Lake, Sue Creek, Ice Lake, Jasper Lake, Tiger Lake IPC3, Alder Lake IPC3).
- Update scripts/generate_matrices.py to generate both _generated_platforms_table.rst and _generated_legacy_platforms_table.rst with vendor icons in the 1st column.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

…to Active Integration

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

…c info to developer guides

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

…veloper guides

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

… flavours

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

- Add 'Status' column to the algorithms and processing modules table
  distinguishing 'Upstream' mainline modules from 'Active Development'
  integrations (FFmpeg LLEXT, WebRTC, Steam Audio, TFLite Micro).
- Integrate ARM SIMD (Cortex-M7 DSP intrinsics from Teensy 4.1 PR) and
  RISC-V SIMD (ESP32-P4 PR) into supported SIMD flavors for accelerated
  modules (Volume, Mixer, SRC, ASRC, EQ FIR, EQ IIR, DRC, Multiband DRC,
  Crossover, DC Blocker, TDFB, Tone).

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

- In data/modules.yaml, rename 'ARM SIMD' to 'ARM' and 'RISC-V SIMD' to 'RISCV'
  for clean, concise SIMD flavor naming.
- In conf.py, update project copyright statement to '2026, SOF Project'.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

- Relocate algorithm implementation and tuning guides (demux, eq, src, tdfb)
  from algos/ to developer_guides/algorithms/.
- Add 'Algorithm Specific Information' section and toctree to developer_guides/index.rst.
- In algos/index.rst, replace the toctree with an informative cross-reference note,
  leaving the Algorithms page focused strictly on the algorithms catalog and SIMD matrix.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

- Dynamically fetch and display latest releases from thesofproject/sof-bin
  via GitHub API at build time with local JSON caching and client-side live check.
- Remove obsolete source and Linux driver git clone sections.
- Add binary release contents overview, target /lib/firmware layout, and installation guide.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>