message: fix: change app description to match the main page title
diff: export const PROJECT_NAME = 'Nextclade' as const
  -export const PROJECT_DESCRIPTION = 'Clade assignment, mutation calling, and quality control right inside your browser' as const
  +export const PROJECT_DESCRIPTION = 'Clade assignment, mutation calling, and sequence quality checks' as const
  export const COPYRIGHT_YEAR_START = 2020 as const
  export const COMPANY_NAME = 'Nextstrain developers' as const
  