Broken logo on about page

[JohnONolan]

Logo on about page is a white background image, which is not compatible with nightshift.

This needs to be using our logo in svg format, and using css filter: invert(100%); in nightshift.

---

This is Ghost logo svg, which can be saved to a new file:

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[JohnONolan]

While we're here - this arrow icon also should be white in nightshift