* 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.
* Update theme.json
Fix the subscribe button width issue with css until it's fixed in Jetpack.
* Update templates
Update theme templates to add custom CSS class.
* Update screenshot.png
* Update footer widgets
Minor updates to the content of the footer widgets.
* Update theme.json
Remove system font. Make headings bold.
* Add strict type declarations.
* Update footer widgets
Update the copy of the About section.
