OGP / Open Graph Protocol, favicon

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• Card Validator | Twitter Developers

• https://qiita.com/kana-t/items/f058f29ddd93e062761c

• https://qiita.com/kogache/items/9e49c94758be8c1c4d77

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• https://qiita.com/uraranbon/items/a143d215b7baa3e9d1a0