Nextstrain Annual Update 2026 blog post

Previous year's blog post for reference: https://next.nextstrain.org/blog/2025-03-31-annual-update-march-2025 Including - team updates - move towards open data - auspice improvements (link to https://github.com/nextstrain/nextstrain.org/issues/1293) - new pathogens - SC2 default no longer GISAID