chore: move app from R to Rmd

src/app.Rmd

@@ -1,3 +1,5 @@
+# Web Interface
+```{r shiny}
 # Flight Trajectory Analysis - Shiny GUI Application
 # This app allows interactive selection of flights and displays trajectory analysis
 
@@ -552,3 +554,4 @@ server <- function(input, output, session) {
 
 # Run the application
 shinyApp(ui = ui, server = server)
+```