* 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.
* Luminance: Add theme
* Fix typo and spacing in style.css
* Luminance: Minor adjustment for post titles
---------
Co-authored-by: Sarah Norris <sarah@sekai.co.uk>
