Version 3.0

• use MongoDB on front-end server to store cluster information (#433)
• split lineages into XBB and main trees, as well as a subset of other recombinants (#489)
• added regression model to predict the number of unsampled infections per lineage (HUNePi) (#472)
• added walkthrough (interactive user guide for webpage) (#461, #28)
• Cypress test suite (#447)
• user can now download mutation list (#419)
• a lovely assortment of bug fixes