add what about dash section

.circleci/config.yml

@@ -27,7 +27,7 @@ jobs:
             sudo apt-get install -y pandoc libudunits2-dev libgdal-dev libxt-dev libglu1-mesa-dev libfftw3-dev
             sudo R -e 'install.packages(c("curl", "devtools", "mvtnorm")); devtools::install_github("hypertidy/anglr"); devtools::install_github("johannesbjork/LaCroixColoR"); devtools::install_github("ropensci/plotly"); install.packages("BiocManager"); BiocManager::install("EBImage"); devtools::install_deps(dependencies = TRUE) '
       - save_cache:
-          key: cache3
+          key: cache4
           paths:
             - "/usr/local/lib/R/site-library"
       - store_artifacts:
@@ -41,8 +41,8 @@ jobs:
             mkdir build
             mkdir build/ggplot2
             mkdir build/r
-            for i in r/*.Rmd; do Rscript -e "rmarkdown::render('$i', output_dir='build/r')"; done
-            for i in ggplot2/*.Rmd; do Rscript -e "rmarkdown::render('$i', output_dir='build/ggplot2')"; done
+            for i in r/*.Rmd; do cat what-about-dash.md >> $i; Rscript -e "rmarkdown::render('$i', output_dir='build/r')"; done
+            for i in ggplot2/*.Rmd; do cat what-about-dash.md >> $i; Rscript -e "rmarkdown::render('$i', output_dir='build/ggplot2')"; done
             python3 -m venv venv
             . venv/bin/activate
             pip3 install python-frontmatter

what-about-dash.md

@@ -0,0 +1,23 @@
+
+### What About Dash?
+
+DashR is an open-source framework for building analytical applications, with no Javascript required, and it is tightly integrated with the Plotly graphing library. Everywhere in this page that you see fig, you can display the same figure in a Dash application by passing it to the figure argument of the Graph component from the built-in dashCoreComponents package like this:
+
+```{r eval=FALSE}
+library(plotly)
+
+fig <- plot_ly() 
+# fig <- fig %>% add_trace( ... )
+# fig <- fig %>% layout( ... ) 
+
+library(dash)
+library(dashCoreComponents)
+library(dashHtmlComponents)
+
+app <- Dash$new()
+app$layout (
+    dccGraph(figure=fig)
+)
+
+app$run_server()
+```