* Update dependencies
* Update eslint-config-vuepress and fix warnings
* Linting
* Save webpack locally
Netlify gave an error for not having it but it wasn't needed before.
* Downgrade webpack
Some users have experienced the Netlify error when upgrading to recently released version 5, so downgrading to latest 4 release.
* Set 'htmlWhitespaceSensitivity' to 'ignore'
