Make version of header with LK speaking, AB listening

And load on every other section header (about, partners, events etc) Closes #66 (closed)

See what you think, let me know if you think I need to tweak anything. I used the only images of me speaking, you listening that we’d highlighted in green (as ok). Tried to line them up with the cans in the original images, keeping them the same size and ensuring our whole bodies fitted in the image space. I kept it with you on the left, me on the right, as I think it makes for a nice little animation between sections.