Fledermap documentation

• How-to guides — task-oriented instructions for something you already know you want to do:
• Set up Fledermap
• Filter the map
• Classify a recording manually
• Listen to and read a recording
• Reference — dry facts to look up while you work:
• CLI commands
• Configuration settings
• Supported species
• Concepts glossary
• Explanation — background and reasoning:
• How Fledermap is organized
• Why map-first?
• The classifier model

For contributors: see contributing.md.