v2.1.0

• use MkDocs instead of Jekyll for documentation (#58, 039e3f8, #62, e450ebe, #64)
• Upgrade to v4.0 of deposit agreement for GDPR (#59, #60, #61, 550deee)
• easy-deposit-agreement-creator now calls the easy-deposit-agreement-generator to generate the PDF (#63)
• upgrade easy-emd dependency from 3.8.2 to 3.9.0 (18b5b45)
• upgrade easy-licenses dependency from 1.0.5 to 1.0.6 (0549d9a)
• fix DANS license URL (8f64598)