Support yml and python formatting in styleguide

This MR force loading of color hilighting for python and yaml.

By default, styleguide only import web based languages.

This removes the following warnings during the build of the doc

Warning: Syntax highlighting for “python” isn’t supported. Supported languages are: plain, plaintext, text, txt, markup, html, mathml, svg, xml, ssml, atom, rss, css, clike, javascript, js, markdown, md, scss, less, flow, typescript, ts, jsx, tsx, graphql, json, webmanifest, bash, shell, diff.

Warning: Syntax highlighting for “yaml” isn’t supported. Supported languages are: plain, plaintext, text, txt, markup, html, mathml, svg, xml, ssml, atom, rss, css, clike, javascript, js, markdown, md, scss, less, flow, typescript, ts, jsx, tsx, graphql, json, webmanifest, bash, shell, diff.