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Add dynamic theme-rendering feature & Provide a 'night' theme implemtation

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1. Add a 'theme' param to http service, to dynamic render to preview page style 2. Provide a 'night' theme implementation those looks like:  > a dark style theme...

Add theme support

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It will co-work with https://github.com/instant-markdown/instant-markdown-d/pull/90 it looks like (**theme=night**):