* 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.
This PR should remove all Headstart Annotations from themes in this repo.
Why? Headstart annotations stored in WP.com themes are generated, tested, and sent for translation via WP-CLI scripts running on subversion-ed WordPress sandboxes. I recently updated Headstart annotations for our 20+ recent themes in order to correct some issues in our FSE Plugin and Page Layout feature. When discussing how to get these annotations updated in this themes repo @michaeldcain and came up with two options.
1. Copy-paste back into the affected themes in this repo.
2. Just remove all the Headstart annotations from this repo.
The second option seemed the simplest. It leaves **all** Headstart annotations on WP.com "ignore-able" for this GH repo and reduces the chance of Headstart annotations becoming out of date in this GH repo, potentially reducing future errors.
* Update drop cap positioning.
* Add italics to verse block, to differentiate it.
* Update selectors for button blocks, for better custom colour fallbacks.
* Update colour selectors, to account for :visited state.
* Update latest comments block to look more like theme's comments.
* Correct table header background colour; remove unneeded borders from table in editor.
* Add spacing under audio, media & text blocks
* Removed empty selectors
* Add border below captions to match non-block content
* Make sure all centred widgets are styled the same
* Add styles for definition lists in editor
* Remove border, border radius from code block in editor
* Add styles to link in file block in editor.
