PyCon CZ design/print guidelines

[honzajavorek]

It's good to have design/print guidelines for suppliers. Examples from 2019:

• https://docs.google.com/document/d/1vGGBXNbMY5mF_eChEds1ua0kGd_Bcy4mffKuIh7jQHc/edit#heading=h.wsbhmqcv5xej
• https://docs.google.com/document/d/1tkydFtS-N5ka2I_uXQFYBK7L3GC-bbJVNq-xI2T7XGU/edit

It would be nice to have these saved as templates and to have meta information in the docs about what should be written in the guidelines etc.

@benabraham can help; see also the Slack thread here.