Add names of "buckets" under Ecosystem on the front page

[rgommers]

Wanted to open this for discussion, to see if these are the right headings/buckets to use or if people have better ideas.

Haven't found the time to write this content unfortunately.

[rgommers]

Some good feedback from @mkg33 was to emphasize also individual scientific domains. One way to do that is copy what https://julialang.org/ does: a "Scientific Domains" tab that then just a range of domains with some explanation and links. It manages to list eight distinct science domains in one paragraph.

[rgommers]

Okay went with the "Scientific Domains" idea for now. Will merge so we can iterate easier.

[rgommers]

We have CI, and it's green:)

@Shekharrajak something didn't quite work, output is:

Run echo "The deployed-domain is "
  echo "The deployed-domain is "
  shell: /bin/bash -e {0}
The deployed-domain is 

and nothing got deployed. maybe you can look into that?

[Shekharrajak]

I am looking at this issue. Thanks for letting me know.

[Shekharrajak]

Fixed at #58