Add scatter plot

[Pepe-Marquez]

Summary by Sourcery

Add a scatter plot feature to the perovskite ions app and enhance the documentation with new guides and acknowledgments. Refactor widget layout configuration for better readability and update tests to accommodate changes.

New Features:

• Introduce a scatter plot feature in the perovskite ions app, allowing visualization of data with customizable axes and markers.

Enhancements:

• Refactor the layout configuration for widgets in the perovskite ions app to improve readability and maintainability.

Documentation:

• Update the documentation to include new sections on creating perovskite compositions, adding new ions, exporting cation structures, and searching for ions.
• Add badges and acknowledgments to the documentation, enhancing its presentation and providing credit to contributors.

Tests:

• Modify the test for importing the solar cell app to ignore type checking, ensuring compatibility with the updated code.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This PR adds a scatter plot widget to the perovskite ions app and reorganizes the documentation structure. The scatter plot visualizes the relationship between A cation molar mass and number of atoms, with structural type as a color marker. The documentation changes include improved organization, new how-to guides, and additional resources.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added a new scatter plot widget to visualize perovskite ion relationships	Implemented scatter plot with A cation molar mass vs number of atoms Added color coding based on structural type Configured responsive layout settings for different screen sizes	src/perovskite_solar_cell_database/apps/perovskite_ions_app.py
Restructured and enhanced documentation	Added new how-to guides for ion-related operations Reorganized navigation structure Added EU funding and project logos Updated installation instructions Improved homepage content organization	docs/index.md mkdocs.yml docs/how_to/install_this_plugin.md docs/how_to/create_a_perovskite_composition.md docs/how_to/add_a_new_ion.md docs/how_to/export_a_cation_structure.md docs/how_to/search_for_ions.md docs/tutorial/sharing_a_perovskite_composition.md

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