[Level 0] Introducing Small Characters and SRS

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@rwesterhof

I just realized Tofugu can easily solve this without implementing a new feature. There are 5 kanji on level 1 that use small kana 上 入 力 十 女 . Simply adding a link to their own article on how to type small kana to the five reading descriptions would do it.

@JenK This might actually solve the problem without needing anything crazy. Just a minor content update would do it.