Enhance documentation and examples for PlotNado

[alsmith151]

• Updated .gitignore to include plotnado-logo.svg.
• Expanded api_reference.md with new helper methods for GenomicFigure.
• Added plotnado-logo.svg asset for branding.
• Created best_practices.md to outline guidelines for figure construction.
• Introduced example_coverage.md to map track types to runnable examples.
• Revised faq.md for clarity and consistency in responses.
• Modified figure_workflows.md to use consistent variable names.
• Updated index.md to improve introductory content and workflow guidance.
• Enhanced installation.md with clearer requirements and installation steps.
• Refined quickstart.md for better clarity and structure in figure creation.
• Reworked quickstart_tracks.md to emphasize preferred track construction methods.
• Added new recipes in recipes.md for practical combinations of options.
• Updated track_aliases.md to clarify alias usage and kwargs routing.
• Revised track_catalog.md to summarize major track families.
• Improved troubleshooting.md for better error handling guidance.
• Updated mkdocs.yaml for improved navigation and branding.
• Enhanced gen_ref_pages.py to generate more informative aesthetics reference.