Dashboard signals update

[melange396]

This brings the COVIDcast dashboard signals up to date by removing inactive signals and adding newer ones...

• CHANGED:
  • hhs : confirmed_admissions_covid_1d_prop_7dav --> hospital-admissions : smoothed_adj_covid19_from_claims
• REMOVED:
  • hhs : confirmed_admissions_influenza_1d_prop_7dav
  • chng : smoothed_adj_outpatient_flu
• ADDED:
  • google-symptoms : s01_smoothed_search
  • google-symptoms : s03_smoothed_search
  • google-symptoms : s04_smoothed_search
  • nssp : pct_ed_visits_covid
  • nssp : pct_ed_visits_influenza

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[melange396]

see a preview of this change at: https://deploy-preview-1264--cmu-delphi-covidcast.netlify.app/
and compare with the live version: https://delphi.cmu.edu/covidcast/

[melange396]

NOTE: this change should be followed by updates to related and long-neglected documentation at:
https://github.com/cmu-delphi/delphi-epidata/blob/17ce59ddf903856cb0b7190fc494dee03a84fa3a/docs/api/covidcast_signals.md?plain=1#L26-L41

[biganemone]

This is a dramatic improvement, and the state of things was so bad before that I say we just move ahead with it based on it looking and feeling more credible. @carlynvandyke is likely to be leading a larger QA effort with Tina's help soonish, which may dig more into details.