Overhaul archive script

* The archive script should be adjusted to the new directory structure
* Additionally, archiving the `js` directory should be an automated step
* When archiving the preview to stable, the redirects should be taken care of. The newly appointed stable pages should have the redirects as those pages are the interesting ones for most users
* When archiving pages, newline characters should be addded to the end of the file, otherwise the Markdown linter will fail