Attribute/Link back to openeo.org docs

[soxofaan]

Reported by @m-mohr : some pages on CDSE docs about openEO are slightly adapted copies of openeo.org docs. For example: getting started docs, glossary, ...

There should be proper attribution to that source material

[soxofaan]

Note that the License of openeo.org material is Apache License 2.0: https://github.com/Open-EO/openeo.org/blob/master/LICENSE which requires proper atttribution