Renamed several files in the covidcast signals folder

docs/api/covidcast-signals/quidel.md

@@ -159,5 +159,5 @@ not enough samples can be filled in from the parent state for smoothed signals s
 no data is reported for that area on that day; an API query for all reported geographic areas on
 that day will not include it.
 
-## Flu Tests (inactive)
-These signals were updated until May 19, 2020. Documentation is still available on the [inactive Quidel page](quidel-inactive.md).
+## Flu Tests
+These signals are inactive. They were updated until May 19, 2020. Documentation is still available on the [inactive Quidel page](quidel-inactive.md).

src/server/endpoints/covidcast_utils/db_sources.csv

@@ -19,7 +19,7 @@ safegraph,safegraph-weekly,SafeGraph (Weekly),[SafeGraph](https://docs.safegraph
 usa-facts,usa-facts,USAFacts,USAFacts is a nonprofit that aggregates and standardizes a vast array of data from US government agencies. This source reports confirmed COVID-19 cases and deaths.,confirmed_incidence_num,CC BY,,[API Documentation](https://cmu-delphi.github.io/delphi-epidata/api/covidcast-signals/usa-facts.html)
 ght,ght,Google Health Trends,"Google Health Trends tracks Google searches on health-related topics. This source includes Google Health Trends API results for overall searcher interest in a set of COVID-19 related terms about anosmia (lack of smell or taste), which emerged as a symptom of the coronavirus. No longer updated after March 8, 2021.",smoothed_search,unknown,,[API Documentation](https://cmu-delphi.github.io/delphi-epidata/api/covidcast-signals/ght.html)
 google-survey,google-survey,Google Symptom Surveys,"Delphi ran symptom surveys using a Google tool which collects responses through publisher websites, Google's Opinions Reward app, and similar applications. No longer updated after May 15, 2020.",smoothed_cli,CC BY,,[API Documentation](https://cmu-delphi.github.io/delphi-epidata/api/covidcast-signals/google-survey.html)
-indicator-combination,indicator-combination-nmf,Statistical Combination (NMF),"This source provides signals which are statistical combinations of other sources, calculated by Delphi. It is not a primary data source. No longer updated after March 17, 2021.",nmf_day_doc_fbs_ght,CC BY,,[API Documentation](https://cmu-delphi.github.io/delphi-epidata/api/covidcast-signals/indicator-combination-inactive.html)
+indicator-combination,indicator-combination-nmf,Statistical Combination (NMF),"This source provides signals which are statistical combinations of other sources, calculated by Delphi. It is not a primary data source. No longer updated after March 17, 2021.",nmf_day_doc_fbs_ght,CC BY,,[API Documentation](https://cmu-delphi.github.io/delphi-epidata/api/covidcast-signals/indicator-combination.html)
 quidel,quidel-flu,Quidel Inc. (Flu),"Quidel, Inc. manufactures diagnostic equipment for healthcare applications, and provides Delphi with anonymized data on tests and test results. This source includes flu tests. No longer updated after May 19, 2020.",smoothed_pct_negative,CC BY,https://cmu.box.com/s/sax48yxnahllrnbqlq6wqxblg6lsyq24,[API Documentation](https://cmu-delphi.github.io/delphi-epidata/api/covidcast-signals/quidel.html#flu-tests)
 safegraph,safegraph-daily,SafeGraph (Daily),"[SafeGraph](https://docs.safegraph.com/docs/social-distancing-metrics) compiles daily mobility information using anonymized location data from mobile phones. This source includes a range of isolation/lockdown behaviors and home dwell time. No longer updated after April 19, 2021.",completely_home_prop,CC BY,https://cmu.box.com/s/m0p1wpet4vuvey7od83n70h0e97ky2kg,[API Documentation](https://cmu-delphi.github.io/delphi-epidata/api/covidcast-signals/safegraph.html)
 nchs-mortality,nchs-mortality,NCHS Mortality Data,"This data source of national provisional death counts is based on death certificate data received and coded by the National Center for Health Statistics ([NCHS](https://www.cdc.gov/nchs/nvss/vsrr/COVID19/index.htm)). This data is different from the death data available from USAFacts and JHU CSSE: deaths are reported by the date they occur, not the date they are reported by local health departments, and data is frequently reissued as additional death certificates from recent weeks are received and tabulated.",deaths_allcause_incidence_num,[NCHS Data Use Agreement](https://www.cdc.gov/nchs/data_access/restrictions.htm),,[API Documentation](https://cmu-delphi.github.io/delphi-epidata/api/covidcast-signals/nchs-mortality.html)