Merge pull request #2958 from plotly/kaleido_conda_forge

Update kaleido instructions to install from conda-forge

Author: nicolaskruchten

README.md

@@ -156,7 +156,7 @@ $ pip install -U kaleido
 or conda.
 
 ```
-$ conda install -c plotly python-kaleido
+$ conda install -c conda-forge python-kaleido
 ```
 
 #### Orca

doc/python/static-image-export.md

@@ -50,7 +50,7 @@ $ pip install -U kaleido
 
 or conda.
 ```
-$ conda install -c plotly python-kaleido
+$ conda install -c conda-forge python-kaleido
 ```
 
 While Kaleido is now the recommended approach, image export can also be supported by the legacy [orca](https://github.com/plotly/orca) command line utility. See the [Orca Management](/python/orca-management/) section for instructions on installing, configuring, and troubleshooting orca.