User guide (#3060)

* user guide

* user guide additions

* light mode images added

* minor edits

* Delete packages/twenty-server/.local-storage/attachment/bd373039-67f7-4da3-ac86-3710d0b8c70d.svg

* Optimize image size

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Co-authored-by: Félix Malfait <felix@twenty.com>
Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-docs/static/img/discord-icon.svg

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