Use versions of logos without background (#1568)

README.md

@@ -1,9 +1,9 @@
 # bqplot
 
 <picture>
-  <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo-dark.svg">
-  <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo.svg">
-  <img alt="bqplot." src="https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo-dark.svg">
+  <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo-dark-nobackground.svg">
+  <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo-nobackground.svg">
+  <img alt="bqplot." src="https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo-dark-nobackground.svg">
 </picture>
 
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/bqplot/bqplot/stable?filepath=examples/Index.ipynb)

docs/index.md

@@ -4,8 +4,8 @@ site_url: https://bqplot.github.io/
 
 # bqplot
 
-![bqplot](https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo.svg#only-light)
-![bqplot](https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo-dark.svg#only-dark)
+![bqplot](https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo-nobackground.svg#only-light)
+![bqplot](https://raw.githubusercontent.com/bqplot/design/master/bqplot-logo-dark-nobackground.svg#only-dark)
 
 `bqplot` is a python based 2-D visualization system for Jupyter, based on the constructs of _Grammar of Graphics_. In `bqplot` every component of the plot is an interactive widget. This allows the user to seamlessly integrate `bqplot` with other Jupyter widgets to create rich visualizations by using just python code!