* Lossless image optimization (using ImageOptim).
This shouldn't change the visual appearance of any images. ImageOptim
was run with the highest compression setting except that JPEG metadata
stripping was disabled because some users prefer to avoid stripping
JPEG metadata.
* Update READMEs that have Changelogs for themes impacted by lossless image optmization change.
* TT2: Add color variations
* rename block-template-parts to template-parts
* Add a header for the pink variation
* Add missing hex
* Update from GH
* Add a header to the yellow variation
* remove the yellow variant
* Remove quaternity and make it secondary
* Update the swiss palette
