Splits up documentations page into "algo+examples" and rest

[basnijholt]

Description

Splits up large single documentations page:

• Algorithms
• Examples

and

• Installation
• Development
• Citing
• Credit
• Authors

Checklist

• Fixed style issues using pre-commit run --all (first install using pip install pre-commit)
• pytest passed

Type of change

Check relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• (Code) style fix or documentation update
• This change requires a documentation update