Use new Github theme-dependent images
-![cocotb logo](/../../../../cocotb/cocotb-web/blob/master/assets/img/cocotb-logo.svg#gh-light-mode-only)
-![cocotb logo](/../../../../cocotb/cocotb-web/blob/master/assets/img/cocotb-logo-dark.svg#gh-dark-mode-only)
+<picture>
+ <source media="(prefers-color-scheme: dark)" srcset="https://www.cocotb.org/assets/img/cocotb-logo-dark.svg">
+ <source media="(prefers-color-scheme: light)" srcset="https://www.cocotb.org/assets/img/cocotb-logo.svg">
+ <img src="https://www.cocotb.org/assets/img/cocotb-logo.svg">
+</picture>
**cocotb** is a coroutine based cosimulation library for writing VHDL and Verilog testbenches in Python.
