EarthCODE library ./examples

[edobrowolska]

Three suggestions here:

• contribute_via_osc_editor.ipynb can be removed as this is only work in progress and does not give much added value. The generation of the preview of the created entry could be done directly from publishing guide as for instance the last step when the collection is generated.

• contribute_via_pr_osc.ipynb could be kept just to show maybe in the demo to new projects on how to contribute but doesn't necesserly need to be available here.. Maybe as internal document as a reference if needed.

• data discovery notebook referenced direclty from the Readme.md file