Ask HN: Single page CMS without PHP etc

Hi

I am looking for a single page CMS ideally only using HTML5 / CSS / Javascript and a local flat file.

The single webpage will contain a list of names and contact numbers etc in a table.

I want an edit button on the page that allows anyone to update the content within the page e.g if someone joins or leaves the company they can update their contact details.

I have found a lot of PHP / MYSQL based single page CMS out there, but wondering if there was something was just HTML / CSS and Javascript based?

Just looking for something really really simple!

Thanks