Run Node from Laravel for HTML to Markdown conversion

[dsebastien]

Explore running Node from Laravel for HTML to Markdown conversion. References:

• https://laracasts.com/discuss/channels/laravel/how-to-run-nodejs-from-laravel-controller
• https://www.npmjs.com/package/node-html-markdown
• https://github.com/mixmark-io/turndown
• https://github.com/crosstype/node-html-markdown

Migrated from TODO.md.