[EPIC] improving openEO documentation

[HansVRP]

In this EPIC we aim to make openEO more user-friendly by contributing and simplifying to the documentation

[HansVRP]

https://openeo.org/documentation/1.0/processes.html is a confusing entry point

[soxofaan]

In EOEPCA's slack I recently stumbled on this interesting pointer on documentation writing and design:
https://diataxis.fr