fix(docs): update docsRepositoryBase

[chogyejin]

In the current stackflow docs built with Nextra, clicking the Edit this page button moves to the Not Found page.

According to the Nextra docs, when using a monorepo, it is necessary to set up a separate base, so I modified docsRepositoryBase property in theme.config.jsx

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Name	Status	Preview	Updated (UTC)
stackflow-docs	✅ Ready (Inspect)	Visit Preview	Mar 12, 2024 5:46pm

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