docs(core): add section to point to building generators/executors

[juristr]

• https://nx-dev-git-fork-juristr-docs-update-generators-exec-2baa60-nrwl.vercel.app/core-features/plugin-features/use-code-generators#build-your-own-generator
• https://nx-dev-git-fork-juristr-docs-update-generators-exec-2baa60-nrwl.vercel.app/core-features/plugin-features/use-task-executors#build-your-own-executor

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 18, 2023 9:30pm

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✅ Successfully ran 6 targets

• nx affected --target=e2e --base=e11d538fa2c7266066d554d9405abab8e0a65040 --head=3826a2339ddf17d0b22cfd35c91f236117a3c62c --parallel=1
• nx affected --targets=lint,test,build --base=e11d538fa2c7266066d554d9405abab8e0a65040 --head=3826a2339ddf17d0b22cfd35c91f236117a3c62c --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=e11d538fa2c7266066d554d9405abab8e0a65040 --head=3826a2339ddf17d0b22cfd35c91f236117a3c62c
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=e11d538fa2c7266066d554d9405abab8e0a65040 --head=3826a2339ddf17d0b22cfd35c91f236117a3c62c

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[isaacplmann]

I agree with Craigory's comment

[github-actions]

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