updated theme

[funkill]

Sync theme with mdbook. Renders without artifacts. But script for change lang dummy needs changing for correct work.

Motivation

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Have you read the Contributing Guidelines on pull requests?

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Test Plan

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[funkill]

Here script takes second item from path and changes it. If book serverd in subpath (e.g. domain.com/path/book/<lang>) this script redirects to wrong url. Currently i haven't any ideas how change url more pretty

[SuccinctPaul]

Thanks for help me.

For the url, actually It doesn't matter. We can make it more beautiful by only move the contents in /book/i18n/.
Like https://chengyuejia.github.io/move/en/introduction.html and https://chengyuejia.github.io/move/zh/introduction.html.

For more detail, you can see my .workflow

[SuccinctPaul]

I've view it . It works fine. Thank you for help me.