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)

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2023 David "Daudix" Lapshin
+Copyright (c) 2024 David "Daudix" Lapshin
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal