Implement "About: All Commissioners" page template

[noahmanger]

So that users can see the complete list of all commissioners ever, create a page that lists all commissioners past and present.

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🖌 Designs (pending)

The complete list of commissioners

Completion criteria:

• Create a new page template that matches the designs

[jenniferthibault]

Here's the link to the All Commissioner page design on InVision.

@patphongs could we enlist your help in getting all the commissioner bio images from the old site? I can crop & re-export them as circles.

@xtine one thought: on the Commissioner bio template page the image will be almost double the size, is it best to export the image at that larger size, and scale down for the smaller instance? Or should I export two sizes?

[xtine]

@jenniferthibault: export the larger size.

[noahmanger]

Resolved by https://github.com/18F/fec-cms/pull/723