[PATCH] patch-detail: move patch diff section up and add collapse button

[Raxel Gutierrez]

Hi,

I didn't wanna create a cover letter for such a small patch, but I
wanted to mention that I think the download buttons bar next to the
patch subject title seems too repetitive. I see the benefit as it's
quicker to locate, but now the "Patch" section is moved up to the
user's viewable area when they go into a patch's page. So, I think
having it only in the "Patch" section suffices.

Best,
Raxel