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This ensures compatibility with zsh.

Fix #2316.

Use -e only in docs targeted at contributors.

If a user copy-pastes  command line with [--editable], they will hit
an error. If they don't know the --editable option, we're giving them
a choice to make before they can move forwards, but this isn't a choice
they need to make right now.

It's superseded by the "docs" extras.

Co-Authored-By: Lysandre Debut <lysandre.debut@reseau.eseo.fr>

Initial folder structure for the documentation. A draft of documentation change has been made in the BertModel class.