README needs "Why earthaccess?" and "one-liner install"

[betolink]

I think the last documentation PR #498 removed too much information from the README, in particular the justification and how to install it.

• "Why earthaccess?
• "How to install earthaccess"

We should try to have one source of true but people usually see a README and expect to get a sense of what the project is about (context) and some basic instructions (how to install it and perhaps an example). I think this is related to how well-known a project is, once that a project gets big enough they prioritize external docs (even with their own domains like https://docs.xarray.dev/en/stable/) but I feel like until we are at that level maybe we should not forget that a README is the first point of entry to a library. Some of the concepts I find relevant come from Art of README

I'm happy to discuss this further!

[Sherwin-14]

@mfisher87 @betolink Hey, do you guys have any specific opinions regarding this? If not, then can I take this issue up?

[mfisher87]

Hey @Sherwin-14 it would be great if you'd be willing to start on this! Some opinions, not sure if @betolink agrees or not :)

• "How to install": pip install earthaccess in the existing "How to get started" section, above the "Visit the quick start" paragraph.
• "Why earthaccess?": Maybe we can re-use the text from "What is earthaccess?"; perhaps just the paragraph starting with "During several workshops"? And maybe that goes in a new section titled "Why earthaccess?" in the README, but I don't have strong feelings about where it should go in the README. Perhaps above "How to get started"?