Use client instead of impresso in documentation to avoid module shadowing

[Copilot]

The documentation showed impresso = impresso.connect(), which shadows the module name and prevents access to module-level exports like DateRange, AND, and OR.

Changes

• Function docstring: Updated connect() example from impresso = connect() to client = connect()
• Documentation: Changed all code examples in docs/preparing_queries.md and docs/resources.md to use client variable
• Example notebooks: Updated all 7 notebooks in examples/notebooks/ to use the new pattern

Before/After

# Before - shadows the module
from impresso import connect
impresso = connect()
impresso.search.find(...)  # Can't use impresso.DateRange anymore

# After - keeps module accessible  
from impresso import connect
client = connect()
client.search.find(...)  # Can still use impresso.DateRange, impresso.AND, etc.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Use client instead of impresso in documentation</issue_title>
<issue_description>As ChatGPT puts it:

Shadowing the module name like
import impresso
impresso = impresso.connect()
technically works, but it’s a bad idea.
• You lose access to the impresso module (no impresso.DateRange, no help(impresso) on the module).
• It breaks introspection and autocomplete.
• It can cause subtle bugs, especially in dynamic/reloading environments.
• It’s confusing for anyone reading or maintaining the code.
✅ Better:
import impresso
client = impresso.connect()
Keeps everything accessible and clear. (edited) </issue_description>

<agent_instructions>Change impresso.connect to client.connect in the documentation </agent_instructions>

Comments on the Issue (you are @copilot in this section)

@caiocmello I made this change in all datalab notebooks already.

• Fixes Use client instead of impresso in documentation #39

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