feat(nx-dev): highlight lines in code samples

[isaacplmann]

• Adds the ability to highlight lines of code in a code sample
• Updates the nx.json and project config guides
• Adds a new "Types of configuration" concept guide

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 18, 2023 2:02pm

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✅ Successfully ran 8 targets

• linux nx affected --target=e2e --base=11249e929bddffec5cff7c14dcd89220a5e5d163 --head=d24132a5f651201fe8b0c0097f3ff0e68402dfe9 --parallel=1
• linux nx affected --target=build --base=11249e929bddffec5cff7c14dcd89220a5e5d163 --head=d24132a5f651201fe8b0c0097f3ff0e68402dfe9 --parallel=3
• linux nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• linux nx affected --target=lint --base=11249e929bddffec5cff7c14dcd89220a5e5d163 --head=d24132a5f651201fe8b0c0097f3ff0e68402dfe9 --parallel=3
• linux nx affected --target=test --base=11249e929bddffec5cff7c14dcd89220a5e5d163 --head=d24132a5f651201fe8b0c0097f3ff0e68402dfe9 --parallel=1
• nx-cloud record -- nx format:check --base=11249e929bddffec5cff7c14dcd89220a5e5d163 --head=d24132a5f651201fe8b0c0097f3ff0e68402dfe9
• linux nx documentation --no-dte
• macos nx affected -t e2e-macos --parallel=1 --base=11249e929bddffec5cff7c14dcd89220a5e5d163 --head=d24132a5f651201fe8b0c0097f3ff0e68402dfe9

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[github-actions]

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