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Remove "CHARSET" config option for MySQL, always use "utf8mb4" ()
In modern days, there is no reason to make users set "charset" anymore.

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## ⚠️ BREAKING

The key `[database].CHARSET` was removed completely as every newer
(>10years) MySQL database supports `utf8mb4` already.
There is a (deliberately) undocumented new fallback option if anyone
still needs to use it, but we don't recommend using it as it simply
causes problems.
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_index.en-us.md Refactor docs ()
_index.zh-cn.md Refactor docs ()
_index.zh-tw.md Refactor docs ()
faq.en-us.md Remove "CHARSET" config option for MySQL, always use "utf8mb4" ()
faq.zh-cn.md Use the new download domain replace the old ()
support.en-us.md Add link to support page for commercial support ()
support.zh-cn.md Refactor docs ()
support.zh-tw.md Refactor docs ()