Built small SEO helper

I started diving into SEO for SaaS Manual. After signing up for a Moz trial account, I thought to review the current issues and start automating the checks as part of the Markdown build step.

I built a very simple plugin, for now only checking the description and keywords. It generates the following output:

You can find the plugin here https://github.com/saasmanual/website/blob/main/src/lib/seo/index.js