Enhance docs

[mbsantiago]

This PR significantly enhances the Whombat user guide by adding two sections:

• Data Import Guide:
  Provides clear, step-by-step instructions on how to import data into Whombat.
  Guides users through importing the example data, allowing them to quickly get started and explore Whombat's capabilities.

• Data Export Guide:
  Explains how to export data from Whombat.
  Includes a practical example demonstrating how to use exported data for developing machine learning detectors. This example covers fundamental data wrangling steps, making it easy for users to apply the process to their own projects.

These additions make the user guide more comprehensive and provide valuable resources for users who want to import and export data effectively and leverage Whombat for machine learning development.

[codecov]

Codecov Report

Attention: Patch coverage is 96.85535% with 10 lines in your changes missing coverage. Please review.

Project coverage is 66.46%. Comparing base (ce5ea11) to head (43d7998).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
back/src/whombat/system/boot.py	60.00%	4 Missing ⚠️
...ack/src/whombat/api/io/aoef/annotation_projects.py	80.00%	3 Missing ⚠️
back/src/whombat/routes/annotation_projects.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   60.69%   66.46%   +5.77%     
==========================================
  Files         179      179              
  Lines        8093     8365     +272     
==========================================
+ Hits         4912     5560     +648     
+ Misses       3181     2805     -376     

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