should not recommend directly printing source SVG for hexagonal-sticker

[Tianyu Chen]

Hi,

I noticed that hexagonal-sticker/src/hexagonal*source.svg are symlinks to
../../pages.debian.net/files/hexagonal*.svg. However, for some source
svgs, they actually contain three layers:

- id="layer2", inkscape:label="bleed"
- id="layer3", inkscape:label="artwork"
- id="layer1", inkscape:label="guidelines"

there's a hexagonal-sticker/Makefile, it builds hexagonal*.svg and
hexagonal*.png from hexagonal*source.svg, only keeping layer3 (artwork).

The png(s) on https://debian.pages.debian.net/debian-flyers/ are without
the guidelines or bleeding, but the svg(s) are. I believe we should tell
people not to print source svg(s) with the guidelines. They should print
the PNG, or SVG with only layer3 (artwork). (or with bleed?)

Also, in the hexagonal svg, there's a link
https://terinjokes.github.io/StickerConstructorSpec/ (which is https://sticker.how now).
It specifies that the recommended hexagon sticker size should be 5.08
centimeters (2 inch). Their repo also has a reference photo with height and
width for hexagon stickers, which is 4.39cm (1.73in) x 5.08cm (2in).

https://github.com/terinjokes/StickersStandard/blob/9711a16/assets/hex-image.png

Maybe for future prints, we want people to print the hexagonal sticker with
the size?

-- 
Best,
Tianyu Chen