docs(orient): repo orientation

[hkimw]

Summary

• add a one-page repository orientation for the docs site
• describe EN/KO source roots, key documentation sections, source-of-truth rules, and build entry points
• link the orientation page from the Introduction sidebar

Tests

• PATH="/tmp/pccx-orient-wt/.venv/bin:/home/hwkim/.local/bin:/home/hwkim/bin:/home/hwkim/.codex/tmp/arg0/codex-arg0RJHmU3:/home/hwkim/.nvm/versions/node/v24.14.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/path:/home/hwkim/.local/bin:/home/hwkim/.local/bin:/home/hwkim/.local/bin:/home/hwkim/.nvm/versions/node/v24.14.0/bin:/tools/Xilinx/2025.2/Model_Composer/bin:/tools/Xilinx/2025.2/Vivado/bin:/tools/Xilinx/2025.2/PDM/bin:/tools/Xilinx/2025.2/Vitis/bin:/tools/Xilinx/2025.2/Vitis/bin:/tools/Xilinx/2025.2/Vitis/gnu/riscv/linux_toolchain/lin32/bin:/tools/Xilinx/2025.2/Vitis/gnu/riscv/linux_toolchain/lin64/bin:/tools/Xilinx/DocNav:/home/hwkim/.cargo/bin:/home/hwkim/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin:/home/hwkim/.claude/plugins/cache/claude-plugins-official/rust-analyzer-lsp/1.0.0/bin:/home/hwkim/.claude/plugins/cache/claude-plugins-official/figma/2.1.30/bin" make strict
• PATH="/tmp/pccx-orient-wt/.venv/bin:/home/hwkim/.local/bin:/home/hwkim/bin:/home/hwkim/.codex/tmp/arg0/codex-arg0RJHmU3:/home/hwkim/.nvm/versions/node/v24.14.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/path:/home/hwkim/.local/bin:/home/hwkim/.local/bin:/home/hwkim/.local/bin:/home/hwkim/.nvm/versions/node/v24.14.0/bin:/tools/Xilinx/2025.2/Model_Composer/bin:/tools/Xilinx/2025.2/Vivado/bin:/tools/Xilinx/2025.2/PDM/bin:/tools/Xilinx/2025.2/Vitis/bin:/tools/Xilinx/2025.2/Vitis/bin:/tools/Xilinx/2025.2/Vitis/gnu/riscv/linux_toolchain/lin32/bin:/tools/Xilinx/2025.2/Vitis/gnu/riscv/linux_toolchain/lin64/bin:/tools/Xilinx/DocNav:/home/hwkim/.cargo/bin:/home/hwkim/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin:/home/hwkim/.claude/plugins/cache/claude-plugins-official/rust-analyzer-lsp/1.0.0/bin:/home/hwkim/.claude/plugins/cache/claude-plugins-official/figma/2.1.30/bin" make lint

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