docs(misc): remove webpack 5 migration guide

[jaysoo]

This PR removes the migration for webpack 5 since it is no longer relevant since it's not applicable for Nx 14 and 15.

The traffic to the page is 0.09% of total traffic for the last 12 months, and 0.06% for past 90 days.

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Name	Status	Preview	Updated
nx-dev	✅ Ready (Inspect)	Visit Preview	Jan 6, 2023 at 1:57PM (UTC)

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✅ Successfully ran 11 targets

• nx affected --target=e2e --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=521f788c3cf55cdac1631a0798c280b49b9c4979 --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox --parallel=1
• nx depcheck --no-dte
• nx affected --target=test --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=521f788c3cf55cdac1631a0798c280b49b9c4979 --parallel=1
• nx affected --target=lint --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=521f788c3cf55cdac1631a0798c280b49b9c4979 --parallel=3
• nx lint --no-dte
• nx check-lock-files --no-dte
• nx check-commit --no-dte
• nx affected --target=build --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=521f788c3cf55cdac1631a0798c280b49b9c4979 --parallel=3
• nx-cloud record -- nx format:check --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=521f788c3cf55cdac1631a0798c280b49b9c4979
• nx check-imports --no-dte
• nx documentation --no-dte

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