epiverse-trace / epiverse-trace/tutorials-early

add a figure on database as a collection of connected tables

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Description

here (after introducing DBI in the "reading from databases" section) we should add a figure to define a database as a collection of connected tables. [This figure could be used as an initial addition](https://jcsites.juniata.edu/faculty/rhodes/dbms/images/univtbls.jpg) and then edit a new one based on it.

(source: https://jcsites.juniata.edu/faculty/rhodes/dbms/relnmodel.htm)

_Originally posted by @avallecam in https://github.com/epiverse-trace/tutorials-early/pull/70#discussion_r1639034217_

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