Explain previews, preview branches, and branches better in the OTTR Guide

[cansavvy]

From an OTTR course, there was some confusion about why the published pages don't match the rendered preview. Short answer is: it's not supposed to match.

@cansavvy The preview is not aligning with the current page. is there any issue?

That is by design. This preview shows you what this particular branch's changes look like, whereas the GitHub pages is publishing from the main branch.

Basically this preview allows you to get an idea of what your changes look like before you make them live by merging to main.

Thanks for this comment, I'll make sure to have the guide explain this concept better!

Originally posted by @cansavvy in abyzovlab/CNVpytor-course#14 (comment)

[cansavvy]

Attempted to address this. Will close for now and reopen if we feel its still an issue.