Deprecate shimotsuma

Posted under Tags

BUR #62820 has been approved by @evazion.

mass update shimotsuma -> yuru-chara -shimotsuma
category shimotsuma -> general
rename shimotsuma -> shimotsuma_(city)

This copyright tag is only used for Shimon, the mascot for Shimotsuma city, so the yuru-chara tag should be used instead. If there were to be actual art of the city, then a Shimotsuma (city) tag could be created, as it follows how other japanese cities are tagged.

Edit: Changed the deprecate of Shimotsuma into a rename.

Updated by Blookryynnn

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