Vision: Earth should be capitalized

### Discussed in https://github.com/openmodelingfoundation/openmodelingfoundation.github.io/discussions/341

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<sup>Originally posted by **platipodium** December  6, 2021</sup>
I suggest to use the uppercase version of **Earth**, to give the Gaian notion of a living and named entity instead of .... a pile of dirt :=)</div>