refactor: docker image to use nginx

Dockerfile

themes/docsy/LICENSE

themes/docsy/README.md

themes/docsy/archetypes/default.md

themes/docsy/assets/css/main.css

themes/docsy/assets/js/main.js

themes/docsy/content/_index.md

themes/docsy/content/posts/_index.md

themes/docsy/content/posts/post-1.md

themes/docsy/content/posts/post-2.md

themes/docsy/content/posts/post-3/bryce-canyon.jpg

themes/docsy/content/posts/post-3/index.md

themes/docsy/hugo.toml

themes/docsy/layouts/_default/baseof.html

themes/docsy/layouts/_default/home.html

themes/docsy/layouts/_default/list.html

themes/docsy/layouts/_default/single.html

themes/docsy/layouts/partials/footer.html

themes/docsy/layouts/partials/head.html

themes/docsy/layouts/partials/head/css.html