chore: skip pr checks when changes are made to docs

[uinstinct]

Description

Both cli and extension pr checks take long (and are sometimes flaky) to finish for small documentation changes. This PR fixes that.

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Tests

[ What tests were added or updated to ensure the changes work as expected? ]

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Summary by cubic

Skip GitHub Actions checks for docs-only changes to speed up docs PRs and reduce flaky runs.

Added paths-ignore: docs/** to the CLI PR checks (pull_request) and the extension pr-checks workflow (pull_request and push).

^{Written for commit 20221a5. Summary will update automatically on new commits.}

[cubic-dev-ai]

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