Update description of github releases in docs. Resolves #3433. 

I also ended up rearranging docs/conf.py a bit.

from pathlib import Path

import typer

from ..out_of_tree import venv
from ..out_of_tree.utils import initialize_pyodide_root


def main(
    dest: Path = typer.Argument(
        ...,
        help="directory to create virtualenv at",
    ),
) -> None:
    """Create a Pyodide virtual environment"""
    initialize_pyodide_root()
    venv.create_pyodide_venv(dest)

from pathlib import Path

import typer

from ..out_of_tree import venv
from ..out_of_tree.utils import initialize_pyodide_root


def main(
    dest: Path = typer.Argument(
        ...,
        help="directory to create virtualenv at",
    ),
) -> None:
    """Create a Pyodide virtual environment"""
    initialize_pyodide_root()
    venv.create_pyodide_venv(dest)
