New coloring of the Giraffe head

Based on [Unifying colors for tuples and segments : r/CollatzProcedure](https://www.reddit.com/r/CollatzProcedure/comments/1lcrr6h/unifying_colors_for_tuples_and_segments/).

Unlike the Zebra head, the series of 5-tuples are limited to the top left side of the figure below. The rest of the neck is handled with series of even triplets, starting with yellow or rosa and going on with blue (and green pairs).

https://preview.redd.it/5vjebxcm9p7f1.jpg?width=692&format=pjpg&auto=webp&s=067a447e0f6ebd208a94dd42ccb30519e3166544

[Overview of the project (structured presentation of the posts with comments) : r/Collatz](https://www.reddit.com/r/Collatz/comments/1k98c5a/overview_of_the_project_structured_presentation/)