Update "Topographical Map" with new shade of black

[secretpatrick]

A couple weeks ago during a website committee meeting, it was decided to change the primary analog shade of black from #1B1B1B to #151A20. The change was applied to the website background color, and the color was listed on the https://scrt.network/brand page. However, the "Topographical Map" image that is displayed at the top of each page still uses the old color. I could provide an updated PNG version of it, but not SVG, so whoever originally created them would probably be the best person for the job.

[the-dusky]

Thanks for mentioning this I will try to fix asap.