[MRG] Update examples in the doc by rflamary · Pull Request #359 · PythonOT/POT

Types of changes

In this PR we are upadting the exmaples inthe doc to make them more interpretable.

List of stuff TODO:

  • Move Screenkhorn to section "other"
  • Update logo with transparent version

Motivation and context / Related issue

How has this been tested (if it applies)

PR checklist

  • I have read the CONTRIBUTING document.
  • The documentation is up-to-date with the changes I made (check build artifacts).
  • All tests passed, and additional code has been covered with new tests.
  • I have added the PR and Issue fix to the RELEASES.md file.