Update readme

[zbraiterman]

I've started to restructure the README.md file to follow the format outlined at https://carpentries.github.io/lesson-development-training/collaborating-newcomers.html#readme.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/carpentries-incubator/r-geospatial-urban/compare/md-outputs..md-outputs-PR-12

The following changes were observed in the rendered markdown documents:

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⏱️ Updated at 2024-01-29 15:28:44 +0000

[cforgaci]

Thanks @zbraiterman for staring to update our README file!