Joss review: Need more documentation on poetry. Also, deprecate pip install instructions about floodlight HOT 3 CLOSED

In particular I think you need to explicitly state that poetry is a replacement for setup.py. And you need to mention that the command poetry install replaces pip install -e.

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@kanishkan91 we have instructions for installation in dev mode both in the CONTRIBUTING.md (short version) as well as the extended contributing guide (long version), both explaining the installation of poetry. I see that for users familiar with setup.py, this might be a bit confusing. I've altered the descriptions in both files at the appropriate places as follows:

• CONTRIBUTING.md: "We use poetry for development and dependency management, which is based on the static pyproject.toml file and replaces setup.py. With poetry, setting up your local dev environment is rather straightforward: [...]"
• Contributing Guide: "[...] Luckily, there's a tool called poetry which simplifies this a lot. poetry works with the static pyproject.toml file containing project metadata, and replaces the usage of setup.py files. Thus, the first step is to install poetry! [...]"

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Looks great. Thanks for the additions!

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