main calls call gff3 file to generate images

[molikd]

dependent on #1

the main call will have to generate our images based on a gff3 file, ideally rendered at tab load.

think about it like this, when building the app questions will be called three times:

questions1 <- taipanQuestions()
questions2 <- taipanQuestions()
questions3 <- taipanQuestions()

for each function that we need to annotate

and then buildTaipan will have to be called as well:

buildTaipan(
  questions = c(questions1, questions2, questions3),
  images = c("https://raw.githubusercontent.com/srkobakian/taipan/master/sample_images/hotdog.jpg",
             "https://raw.githubusercontent.com/srkobakian/taipan/master/sample_images/not_hotdog.jpg"),
  appdir = file.path(tempdir(), "taipan"), overwrite = TRUE
)

we can prebuild the images or we could update it so that each "image" is a line in a gff3 file, which probably makes more sense. This means that under " # CONSTRUCT IMAGE DIR" we will have to rewrite to accommodate a gff3 row instead, just make it a text file I guess.

The tabs should generate the corresponding image for that activity (this will be done in server.R and app.R)

a bit hacky, but the quickest way to a working prototype.