authorship, citation, and attribution policies

[JessicaS11]

Our recent publication of all releases on Zenodo required we revisit our outdated authorship/attribution guidelines and update them to our current practices. This PR aims to update, standardize, and simplify our practices to universally recognize the "icepyx Developers" as the first author (and only author on Zenodo) of our software package.

Partially address #414.

EDIT: I would be interested in finding a way to highlight the elusively defined "significant" contributions, as well as maintainers... would be happy to add that to this PR or in a future one.

[github-actions[bot]]

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[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d9a9d94) 59.09% compared to head (976730e) 59.09%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #419 +/- ## ============================================ Coverage 59.09% 59.09% ============================================ Files 30 30 Lines 2264 2264 Branches 488 488 ============================================ Hits 1338 1338 Misses 843 843 Partials 83 83 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icesat2py). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=icesat2py)

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