Add Sphinx exclude_patterns to _config.yml to ignore virtual environments, site-packages, and build directories during doc builds (".venv/**", "venv/**", "**/site-packages/**", "_build/**", "**/_build/**"). Reformat _toc.yml into a proper jb-book "parts:" structure with correctly nested captions and chapters, normalize emoji-bearing captions with quotes, and restore many documentation sections. Also add a placeholder "DLC-Live!" entry with nested chapters/sections for the dlc-live GUI documentation. These changes clean up the table of contents and prevent unrelated files from being included in the documentation build.