Fix validateDOMNesting errors within <p> of <Hover>

[aspiers]

The <Hover> element under <Action> tries to nest <pre> and <div> under <p>, leading to errors such as:

react-dom.development.js:88 Warning: validateDOMNesting(...): <pre> cannot appear as a descendant of <p>.
    in pre (created by Action)
    in div (created by Action)
    in div (created by Action)
    in p (created by Action)
    in div (created by Action)
    in div (created by Hover)
    in Hover (created by ReactHover)
    in div (created by ReactHover)
    in ReactHover (created by Action)
    in div (created by Action)
    in Action (created by ActionContainer)
    in div (created by ActionContainer)
    in div (created by ActionContainer)
    in div (created by ActionContainer)
    in ActionContainer (created by MainContainer)
    in div (created by MainContainer)
    in div (created by MainContainer)
    in MainContainer (created by App)
    in App

So remove the <p> wrapping to fix these errors.