refactor(core): remove useless Webpack wait plugin

[slorber]

Motivation

dead code that I forgot to remove when I moved SSG out of the webpack compiling process

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✅ [V2]

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[github-actions]

Size Change: +349 B (0%)

Total Size: 11.2 MB

ℹ️ View Unchanged

Filename	Size	Change
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website/.docusaurus/docusaurus.config.mjs	28 kB	0 B
website/.docusaurus/globalData.json	30.2 kB	0 B
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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	Report
/	🟠 71	🟢 98	🟢 96	🟢 100	Report
/docs/installation	🟠 54	🟢 97	🟢 100	🟢 100	Report
/docs/category/getting-started	🟠 74	🟢 100	🟢 100	🟠 86	Report
/blog	🟠 68	🟢 96	🟢 100	🟠 86	Report
/blog/preparing-your-site-for-docusaurus-v3	🔴 47	🟢 92	🟢 100	🟢 100	Report
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/blog/tags	🟠 70	🟢 100	🟢 100	🟠 86	Report