Mkdocs-material

* Added Dutch translations
* Adjusted targeted link and footnote offsets
* Simplified admonition styles and fixed padding bug

* Fixed 616: Minor styling error with title-only admonitions
* Removed border for table of contents and improved spacing

* Added support for hero teaser
* Added Portuguese translations
* Fixed 586: Footnote backref target offset regression
* Fixed 605: Search stemmers not correctly loaded

* Replaced deprecated babel-preset-es2015 with babel-preset-env
* Refactored Gulp build pipeline with Webpack
* Removed right border on sidebars
* Fixed broken color transition on header

* Added support for white as a primary color
* Added support for sliding site name and title
* Fixed redundant clipboard button when using line numbers on code blocks
* Improved header appearance by making it taller
* Improved tabs appearance
* Improved CSS customizability by leveraging inheritance
* Removed scroll shadows via background-attachment
* Removed breadcrumbs from header

* Fixed details not opening with footnote reference