paper: Rewrite Spaces section

[EwoutH]

Rewrote the Spaces section the JOSS paper to be clearer and more concise, while trying to retain the key technical details.

• Rendered PDF download

[quaquel]

This might be a taste issue, but I think this shortening takes the shortening (which indeed is possible here) a few steps too far. Did we hear anything about how strict the 1000 word requirement is?

[EwoutH]

@quaquel not yet, I think they will tell us on review if it's too long.

I rewrote it slightly more extensively in d2ad692, I think I found a nice middle ground (this PR is updated).

[quaquel]

Thanks for the quick response. I have a few additional suggestions.

[quaquel]

a few more minor things

[EwoutH]

Thanks! Would you like to make a few edits to this branch directly?

[quaquel]

Thanks! Would you like to make a few edits to this branch directly?

I can do that as well, but I think we are basically there with the last few suggestions.

[EwoutH]

Implemented all suggestions

[quaquel]

looks good to me