Add info about NASA grant and changing climate wrt OSS support

@cmarmo

I dug a bit more on the web... I'm reporting here what I found, in case it may be useful for someone else.

The most recent OSS policy from NASA apparently is
https://smd-cms.nasa.gov/wp-content/uploads/2023/08/smd-information-policy-spd-41a.pdf
Items G and H page 8 state

* "SMD shall foster and encourage contributions and engagement with the open source community from all Federal employees, contractors, and grantees. This includes leveraging existing open source software and communities"
* "SMD should foster and encourage contributions and engagement with communities and organizations setting standards and best practices."

From https://science.nasa.gov/researchers/open-science/science-information-policy_faq/
"NASA personnel can contribute to work-related open source projects with approval from their manager."

### Some older documents

https://nodis3.gsfc.nasa.gov/npg_img/N_PR_2210_001E_/N_PR_2210_001E_.pdf (page 21 3.2.2.5 Contributions to qualifying Third-Party Open-Source Projects)

https://obamawhitehouse.archives.gov/sites/default/files/omb/memoranda/2016/m_16_21.pdf (page 8 5.2 Participation in the Open Source Community): where I particularly like "encourages Federal employees and contractors to contribute back to the broader OSS community by making contributions to existing OSS projects. "

@kelle

Here are the funding opportunities from NASA for OSS: https://science.nasa.gov/researchers/open-science/nasa-open-science-funding-opportunities/

We could add something about the changing climate and our NASA grant to the Astropy History on the webpage. 🤔

Localiza la página web de Astropy History y revisa los enlaces sobre la política y la financiación de NASA en el issue. Decide con los maintainers qué información sobre la subvención de NASA y el cambiante clima de apoyo al OSS debe incluirse allí; se considerará terminado cuando se haya añadido el contexto histórico acordado con enlaces y redacción precisos.

Escrito por el modelo de indexación a partir del texto del issue.