Updated logo

The Quantus logo has been redesigned to be cleaner, more vibrant, and better reflect the brand.  I feel it is important to have an exciting logo in order to make physics labs exciting (just in case the science doesn't speak for itself). Vibrant colours make the brand more energetic and fun while still maintaining a professional appearance. Additionally, the logo was designed to still look good when printed at a low resolution on a PCB's silkscreen layer. Most significantly, the plus/minus sign was replaced with graph wave. I feel the new logo better represents the results one achieves from using Quantus: Meaningful data, not the error associated with taking a measurement. Other small changes include matching the logo's stroke with with that of the typography, using the curve of the letter "u" on the three rounded corners instead of a quarter-circle, and ensuring the dimensions agree with the typography.