improve documentation for venv and venvPath

[DetachHead]

fixes #365

flowchart TD
    A{{"are you using vscode?"}} -- YES --> B["use the environment picker in the python extension"]
    A -- NO --> C{{"are you using a virtual environment?"}}
    C -- NO --> E["it should use the correct python interpreter by default, no config required"]
    C -- YES --> D{{"are you launching basedpyright from inside the virtual environment?"}}
    D -- YES --> E
    D -- NO --> F{{"are there other developers working on your project?"}}
    F -- YES --> G{{"is the virtual environment located in the same place on each developer's machine?"}}
    F -- NO --> H["set venv and venvPath in pyproject.toml or pyrightconfig.json"]
    G -- YES --> H
    G -- NO --> I{{"are you using the CLI or the language server?"}}
    I -- CLI --> J["use the --pythonpath CLI argument"]
    I -- language server --> K["set python.pythonPath in your language server config"]

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[DetachHead]

closing in favor of #1006