Add philosophy section to the docs

[arcondello]

No description provided.

[JoelPasvolsky]

This is good. My only thoughts so far are these:

1. A less generic header instead of "Features". Perhaps "Design Principals"?
2. an explicit link to the new page; for example, "dwave-optimization and the hybrid nonlinear solver incorporate features and :ref:design principals <optimization_philosophy> from each of the following areas:"
3. In the context of a description, the text in the boxes should be descriptive too (e.g., "Exploiting quantum-mechanical effects not available to classical compute" and "Solving optimization problems with linear program solvers")

[arcondello]

Agree with the first two. For (3) it's a box we want people to click, so IMO the imperative makes that clearer.

[JoelPasvolsky]

Agree with the first two. For (3) it's a box we want people to click, so IMO the imperative makes that clearer.

I wouldn't understand it that way, if I see "Learn the basics of solving optimization problems with linear program solvers" I'd expect that clicking would move me away from learning about dwave-optimization to some LP tutorial. As a new user, I'm here to learn to use the NL solver. Perhaps we can use an icon or something to clarify that clicking will take them to a knowledge resource on the underlying design ideas.