add api key to all R covidcast use

Author: minhkhul

content/blog/2020-08-26-fb-survey.Rmd

@@ -47,6 +47,10 @@ output:
     toc: true
 ---
 
+```{r, echo=FALSE}
+options(covidcast.auth = "9328d11cfe46d") # Minh's key
+```
+
 Since April 2020, in collaboration with Facebook,
 partner universities, and public health officials,
 we've been conducting a massive daily survey to monitor

content/blog/2020-10-06-survey-wave-4.Rmd

@@ -30,7 +30,9 @@ output:
   blogdown::html_page:
     toc: true
 ---
-
+```{r, echo=FALSE}
+options(covidcast.auth = "9328d11cfe46d") # Minh's key
+```
 Beginning in early April 2020, the `r blogdown::shortcode_html("reflink", "/", "Delphi group")` has
 conducted a major survey to track COVID-19 across the United States. With the
 support of Facebook Data for Good, we have been able to recruit tens of

content/blog/2020-12-10-masks-public.Rmd

@@ -21,6 +21,10 @@ output:
     toc: true
 ---
 
+```{r, echo=FALSE}
+options(covidcast.auth = "9328d11cfe46d") # Minh's key
+```
+
 As COVID cases and deaths continue to rise in the United States, we are
 repeatedly reminded that unless we take the appropriate precautions---by wearing
 masks when around other people, working from home whenever possible, and

content/blog/2021-01-15-causal-effect-mobility.Rmd

@@ -27,6 +27,10 @@ output:
     toc: true
 ---
 
+```{r, echo=FALSE}
+options(covidcast.auth = "9328d11cfe46d") # Minh's key
+```
+
 ```{r setup, include=FALSE}
 knitr::opts_chunk$set(collapse = TRUE)
 ```

content/blog/2021-01-22-holiday-surveys.Rmd

@@ -29,7 +29,9 @@ output:
   blogdown::html_page:
     toc: true
 ---
-
+```{r, echo=FALSE}
+options(covidcast.auth = "9328d11cfe46d") # Minh's key
+```
 With pandemic fatigue setting in across the United States after a long year
 filled with uncertainty, many felt the temptation to celebrate a “normal”
 Thanksgiving and Christmas. However, with cases steeply rising across the US,