Mkdocs-with-pdf

* Fixed links hash that contains percent encoding.

* Fixed links containing escape characters.
* Updated `material-polyfills.css`.

* Fixed a missing JS file entry in `MANIFEST.in`.
* Changed for `Headless Chrome` launch options.
* Changed the default value of the `Headless Chrome` pathname option.

* Support two-columns layout.
* Supports the use of `Headless Chrome`.
* Fix details icon style for material and little more.

* Add the missing anchors if the document doesn't have first-level headings.
* Add a workaround converter for 'img[align]'.

* Add 'convert_iframe' option.
* Modified some 'page-break' settings.
* Changes the required version of python.