There is no guide because both are different templates. And each template has its own styling.
But you do follow these steps:
1. Take a site backup and install it on sub-domain
2. Then install the Boston template and set it as the default template.
3. Export the template settings from Astroid and Import in the Boston template. docs.joomdev.com/article/astroid-export-import/
Thanks,
Chandan
Thank You,
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