Add webinar banner to README

[meili-bot]

This PR is auto-generated.

Update README.md with Webinar Banner.

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (fe14754) 88.58% compared to head (d199268) 88.58%.

:exclamation: Current head d199268 differs from pull request most recent head 4203f8e. Consider uploading reports for the commit 4203f8e to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #305 +/- ## ======================================= Coverage 88.58% 88.58% ======================================= Files 10 10 Lines 648 648 ======================================= Hits 574 574 Misses 74 74 ```

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[meili-bors[bot]]

Build failed:

• integration-tests (Rails 7 with Ruby 3.1)

[curquiza]

Merging manually -> this PR is not related to issue we have with the CI