Create SIMPLE Demos

[canavarrete01]

Short description: Moved from secret simple, two notebooks for querying the database and another for visualizing spectra and data.

[canavarrete01]

@kelle QueryDemo.ipynb needs comments / notes on how to further improve the notebook!

[Copilot]

Pull Request Overview

This PR creates demonstration notebooks for the SIMPLE database project, specifically adding a visualization demo notebook that shows users how to visualize spectra and data from the database.

• Adds a new Jupyter notebook focused on visualizing spectra with SIMPLE
• Provides a structured template for demonstration purposes with placeholder sections
• Includes necessary imports for spectral data visualization and database querying

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[dr-rodriguez]

I would not have this cell. You've shown how to use the Astrodbkit query methods and how to use sql_query, but now you're going into low-level API for SQLAlchemy itself. While useful, it probably doesn't belong in a notebook demonstrating quick/useful queries of SIMPLE.

[dr-rodriguez]

Same for this cell and the rest of the notebook. This is not a SQLAlchemy notebook, it is a SIMPLE notebook. It's also not a visualization notebook. I recommend removing the cells with the low-level sqlalchemy aspects and moving the visualization stuff to the other notebook (I haven't taken a look at that one yet).

[canavarrete01]

Notes from SIMPLE Coworking:

1. Simplify the query notebook
2. Fix typos in markdown
3. Add further markdown information instead of print() statements
4. Use specutils/astropy/astrodb-utils as much as possible to avoid making the notebook too pandas-y and non-intuitive
5. Stop after three visualization examples (plot one object's single spectra, plot various spectra from the single source, plot a spectra from various sources)

[kelle]

the QueryDemo notebook should be shorter. Move everything after "Have a more complex query? Let use astrodb_utils.sql_query to run a SQL query directly" to a separate notebook.

[kelle]

The new flow in the spectra notebook is good! It should stop after the nicely formatted figure with the three spectra. Everything after "Now lets try plotting spectra from multiple sources using a couple different metrics we can decide on within SIMPLE" should go into a separate notebook.

[kelle]

Great work!