Add Outcome Column to Table

[seanprashad]

Each question that is found in the list has a specific purpose on what the learning outcome/new technique an individual adds to their own toolkit.

For example, the Subsets question introduces a Backtracking skeleton, which can be almost copy-pasted for other similar questions, like Permutations and Generate Parentheses.

I think it'd be great to have a hidden field that reveals the intended learning outcome when clicked. It could also be a tooltip that displays the optimal time/space complexity in addition to a short blurb about the outcome.

[seanprashad]

Tied to #1