docs(testing): add playwright overview page

[barbados-clemens]

Current Behavior

No overview page for the playwright plugin

Expected Behavior

a simple overview page explaining nx and playwright.

Related Issue(s)

follow up for #18275

Fixes #

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 2, 2023 1:21pm

[nx-cloud]

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✅ Successfully ran 7 targets

• linux nx affected --target=e2e --base=aa2df9f4170ceba69079c8ccb58026669d026105 --head=e565e00cfc6080d58b5988c695026c12cefccc1a --parallel=1
• linux nx affected --target=build --base=aa2df9f4170ceba69079c8ccb58026669d026105 --head=e565e00cfc6080d58b5988c695026c12cefccc1a --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=test --base=aa2df9f4170ceba69079c8ccb58026669d026105 --head=e565e00cfc6080d58b5988c695026c12cefccc1a --parallel=1
• linux nx affected --target=lint --base=aa2df9f4170ceba69079c8ccb58026669d026105 --head=e565e00cfc6080d58b5988c695026c12cefccc1a --parallel=3
• nx-cloud record -- nx format:check --base=aa2df9f4170ceba69079c8ccb58026669d026105 --head=e565e00cfc6080d58b5988c695026c12cefccc1a
• linux nx documentation --no-dte

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[isaacplmann]

A few changes

[github-actions]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.