update README

public/pkgdown.css

public/pkgdown.js

public/pkgdown.yml

public/reference/add_known.html

public/reference/arrivals.FUN.html

public/reference/as.data.frame.seiqhrf.html

public/reference/control_seiqhrf.html

public/reference/crosscheck_seiqhrf.html

public/reference/cum_discr_si.html

public/reference/departures.FUN.html

public/reference/format_sims.html

public/reference/get_ci.html

public/reference/get_prev.FUN.html

public/reference/get_weekly_local.html

public/reference/index.html

public/reference/infection.FUN.html

public/reference/init_seiqhrf.html

public/reference/init_status.icm.html

public/reference/initialize.FUN.html

public/reference/merge.seiqhrf.icm.html