Updated to Highlightjs 8.6 with all languages supported.

Allows to specify PORT from env on multiplex plugin

enabling launching presentation with npm-start

broken <table> html in demo deck

`licenses` field is deprecated

the `licenses` field in package.json is deprecated. https://docs.npmjs.com/files/package.json#license

The `license` field is the recommended field and expects an SPDX expression.

Removed leap motion plugin from main project

PDF exporting also works with Chromium

Added missing comma on the configuration example

Correct Readme.md -> Theming -> sky

Update index.html

Added https prefix to slideshare iframe link, without this I got a 'not found' error when opening the demo locally.

For those who can't install Google Chrome (e.g. work network policies) but can use Chromium, Chromium does work for creating the pdf. I updated the readme accordingly. Thanks!

Theming/sky.css has dark gray text on light blue background; not white text