Adds a demonstration dashboard addon intended for tutorial or presentation purposes, not for production use. It shows how a dashboard can display data, reusable cards, counters, and a pie chart in Odoo's web interface.

**This Pull Request should not be merged!**

This PR contains a few commits that illustrates how to create a dashboard in the odoo web framework.

This update adds a keyboard shortcut to the Pay Now button within the account payment workflows. This will allow users to initiate payments more quickly and efficiently, streamlining the payment process and reducing the time spent navigating the interface.

Self explanatory.

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