Ensured that Sphinx ignores the repository README file,
Customized the Sphinx configuration file.
Defined chapters for the C/C++ Guide and Common Lisp Guide.
Squashed '.themes/' content from commit b5fc871

git-subtree-dir: .themes
git-subtree-split: b5fc8717be01639a2e22dbcc5b4b30ef6ad46f4a
Merged the https://github.com/dryproject/sphinx-themes subtree.
Customized the Sphinx configuration file.
Added some initial top-level structure.
Fixed LaTeX UTF-8 problems due to characters in `tree` output.
Reorganized the TOC, removing a superfluous level.
Added some initial material on C/C++ conventions.
Added placeholders for chapters on static analysis.
Added some basic contributor guidelines.