remove old, deprecated and obsolete themes

themes/Lanyon/layouts/index.html

themes/Lanyon/layouts/indexes/category.html

themes/Lanyon/layouts/indexes/indexes.html

themes/Lanyon/layouts/indexes/posts.html

themes/Lanyon/layouts/partials/categories.html

themes/Lanyon/layouts/partials/footer.html

themes/Lanyon/layouts/partials/ga.html

themes/Lanyon/layouts/partials/head_includes.html

themes/Lanyon/layouts/partials/header.html

themes/Lanyon/layouts/partials/prev_next.html

themes/Lanyon/layouts/partials/sidebar.html

themes/Lanyon/layouts/posts/li.html

themes/Lanyon/layouts/posts/single.html

themes/Lanyon/layouts/posts/summary.html

themes/Lanyon/static/css/lanyon.css

themes/Lanyon/static/css/poole.css

themes/beautifulhugo/.gitattributes

themes/beautifulhugo/.gitignore

themes/beautifulhugo/LICENSE

themes/beautifulhugo/README.md