Update intro-notebook to allow figure window resizing in colab

[sugatoray]

Description

The fix for #21 should be incorporated in the intro-notebook.

Source code

I have added the following in the notebook and will submit it in new pull request.

## Run this cell once and then 
## comment it out after first run
import leafmap
leafmap.update_package()
print("Restarting notebook server...")
import os
os.kill(os.getpid(), 9)

Suggested change

[giswqs]

leafmap_update_package() is only needed for new features that have not been released to PyPI and conda-forge. Running leafmap_update_package() in every notebook is discouraged as it will reinstall all the dependencies and this could result in issues for some users.