promotional: Add Guix HPC Workshop 2023 designs.
New files:
* promotional/guix-hpc-workshop-2023/README.html
* promotional/guix-hpc-workshop-2023/README.org
* promotional/guix-hpc-workshop-2023/T-SHIRT-MOCKUP-MEN.png
* promotional/guix-hpc-workshop-2023/T-SHIRT-MOCKUP-WOMEN.png
* promotional/guix-hpc-workshop-2023/designs/T-SHIRT-BACK.svg
* promotional/guix-hpc-workshop-2023/designs/T-SHIRT-FRONT.svg
* promotional/guix-hpc-workshop-2023/manifest.scm
* promotional/guix-hpc-workshop-2023/mockups/T-SHIRT-MEN-BACK.png
* promotional/guix-hpc-workshop-2023/mockups/T-SHIRT-MEN-FRONT.png
* promotional/guix-hpc-workshop-2023/mockups/T-SHIRT-MOCKUP-MEN.svg
* promotional/guix-hpc-workshop-2023/mockups/T-SHIRT-MOCKUP-WOMEN.svg
* promotional/guix-hpc-workshop-2023/mockups/T-SHIRT-WOMEN-BACK.png
* promotional/guix-hpc-workshop-2023/mockups/T-SHIRT-WOMEN-FRONT.png
* promotional/guix-hpc-workshop-2023/printables/T-SHIRT-BACK.pdf
* promotional/guix-hpc-workshop-2023/printables/T-SHIRT-BACK.png
* promotional/guix-hpc-workshop-2023/printables/T-SHIRT-FRONT.pdf
* promotional/guix-hpc-workshop-2023/printables/T-SHIRT-FRONT.png
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
aaa5b06f2b
