[Feature]: Preview post before publishing

[catch-21]

Describe the problem

Given the support for a subset of markdown formatting such as bold, italics, inline code, and code blocks, a few of us like the idea of being able to preview a post before publishing it.

Describe the solution

Add a tab, like Github has, for previewing exactly how your post will look to others before you commit to publishing it.

Additional context

This should probably go by design before implementation.