Create pagedown template tips and tricks

[tvroylandt]

Some tips and tricks i'm using with pagedown/ rmarkdown template :

• sometimes it's easier to use magick to design the background and avoid dealing with multiples images in CSS - see https://github.com/rfortherestofus/colibri/blob/main/inst/assets/title_page_background.R

• in this case, you must be careful to scale everything right. I'm setting up parameters at the beginning to ease the changes after - see https://github.com/rfortherestofus/colibri/blob/main/inst/assets/title_page_background.R#L12

• you can have some transparent image in png which turn black into jpg - use image_flatten in this case

• always use CSS variables and modules organization

[tvroylandt]

I'm not posting this now because we see the logo of the client and we are on Saturday, so not a good day for Twitter posting