New translation: /glossary/webpack.md

[vinicius98s]

Qual o objetivo dessa pull request?

• Adição de uma nova tradução
• Correção em uma tradução existente

Qual arquivo foi traduzido/corrigido?

https://github.com/gatsbyjs/gatsby-pt-BR/blob/master/docs/docs/glossary/webpack.md

[iaurg]

Ótima tradução, obrigado por contribuir @vinicius98s

[henriquepw]

🎉 Aprovado!

[gatsbot]

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