update README

.gitignore

@@ -6,3 +6,4 @@ carbon-intensity-app.Rproj
 rsconnect/
 .DS_Store
 .Renviron
+README.html

README.md

@@ -1,3 +1,9 @@
-# carbon-intensity-app
+# How much electricity is made from renewable sources in UK?
 
-link to the [app on shinyapps.io](https://kasiakulma.shinyapps.io/carbon-intensity-app/)
+Our electricity is not made equal and can be associated with higher or lower carbon intensity. How much of UK's electricity is produced using renewable sources? Has it decreased or increased over time? [This Shiny app](https://kasiakulma.shinyapps.io/carbon-intensity-app/) will help answer these questions.
+
+The web app and the underlying data pipeline was built using open source tools. Web app's front-end was built using Shiny, electricity composition was extracted from National Grid's [Carbon Intensity API](https://carbonintensity.org.uk/) using [{intensegRid}](https://kkulma.github.io/intensegRid/articles/intro-to-carbon-intensity.html) package. Data and deployment pipelines were developed using GitHub Actions: `schedule.yml` pulls the carbon intensity data from the API, saves it in `data/daily_ci.rds` file daily and pushes the changes to the repo; `deploy.yml` deploys the changes to the [shinyapps.io server](https://kasiakulma.shinyapps.io/carbon-intensity-app/) on push. 
+
+
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ui.R

@@ -2,7 +2,7 @@ ui <- fluidPage(
   theme = my_theme,
   div(
     id = "header",
-    titlePanel(h1("How much UK energy is renewable?", align = "center")),
+    titlePanel(h1("How much UK electricity comes from renewable sources?", align = "center")),
     div(
       style = "display: inline-block; width: 250px;",
       span("View as heatmap", style = "font-size: large;"),