Some improvements to the config (breaking changes!)

- Remove support for per-page/section emoji favicon (breaking change!)
- Update copyright year
- Improve code comments in config
- Introduce a new configuration variable: locale; used for defining comment timestamp locale
- Fix code blocks having every other line being darker in some complex cases (unset leftover styles from "table")
- Fix code block "mark" having an edge highlight (leftover style from "mark")
- Use get_url for code block styles
- Always use png favicon as a fallback
- Get rid of transparency and roundness in apple-touch-icon (as recommended by 🤮pple)

sass/_crt.scss

@@ -8,7 +8,6 @@
 		animation: flicker 0.25s alternate infinite;
 		margin: unset;
 		box-shadow: unset;
-		// Unset some <pre> stuff
 		background-color: unset;
 		padding: 1rem 1rem;
 		color: var(--primary-color);