Update export-import.md

[paskalito]

Added a more or less step for step guide on how to export import from deck to deck, and corrected a command.

[luka-nextcloud]

Thank you for opening the PR 👍
Could you rebase the main branch?

[paskalito]

Thank you for opening the PR 👍 Could you rebase the main branch?

You arw welcome, as i understand this is still not the official place for documentation dough?
im glad you merged it!
is rebasing still required, or can i delete my branch?

[luka-nextcloud]

@paskalito As I understand, it is the official place for documentation. Latest document will be published to https://deck.readthedocs.io/en/latest/. Rebase is not required anymore. Thanks.

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