Eliminate leaf text nodes on web

[tomekzaw]

Current Behavior

Currently we treat text that is not wrapped with markdown as a text node and line breaks as \n, this makes the library prone to errors related with scrolling & cursor movement.

Expected Behavior

1. All leaf text nodes should be wrapped by an individual tag
2. We should use <br> instead of \n
3. (optional) Each new paragraph / line of text should be wrapped with <p> tag