Add the ability to preview link URL without following it

[santosh]

Currently when we press f or F we are given a tag of letter(s) on each link to follow them.

For a example, we have a link to Github. We can press _f_ followed by _M_ (let's just assume) to open the link in the same tab.

There should be a feature/command in which user should be able to just see where is that text is linked to (as same as when we hover the mouse over the link).

Note : When we just talk about Google Chrome (without extension). When you browse through keyboard and you have to cycle the link through TAB, you are able to see the link at the bottom left of the page.

[aaronhall]

Sorta kinda related to #582. But in this case, the only way I see this working is by adding a command (replacing F) that shows the URL somewhere when a link hint is completed, with a follow-up command to follow the link. This is niche-y, but it's the #1 or 2 reason I reach for my mouse in Chrome now.

[philc]

@int3 may implement this in his work on #603.

[smblott-github]

Closing this in favour of discussion over in #320.