da12320a0c
Made the checkerboard background be more flexible in terms of scale and coloring. Provides dark theme for image diff.
I suppose these colors should not be re-used for a color-picker for a example, because it's usually more convenient to always have it in the light mode.
## Test
* go to
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theme-forgejo-auto-deuteranopia-protanopia.css | ||
theme-forgejo-auto-tritanopia.css | ||
theme-forgejo-auto.css | ||
theme-forgejo-dark-deuteranopia-protanopia.css | ||
theme-forgejo-dark-tritanopia.css | ||
theme-forgejo-dark.css | ||
theme-forgejo-light-deuteranopia-protanopia.css | ||
theme-forgejo-light-tritanopia.css | ||
theme-forgejo-light.css | ||
theme-gitea-auto.css | ||
theme-gitea-dark.css | ||
theme-gitea-light.css |