[feature] Sidebar with links to each ES version

[thiagodp]

Currently, the page header shows a clickable link to ES2015 (called "Node.js ES2015 Support").

Instead, it could show a toggle button that displays a sidebar with each available ES version. Something like this (when it's opened):

[atian25]

+1 for this.

and could use it to filter the table.

scene: when configuring eslint's ecmaVersion, need to figure up the special node version support

[williamkapke]

Cool. Any interest in creating a PR for this?

[thiagodp]

@williamkapke Sorry, not used to work with pug (and no time to learn it now).