Fix ruff PERF203 + PERF401 violations

[janosh]

1adaf28 link docs from readme badge
3b0d635 bump ruff and opt in to beta notebooks linting
9688c97 fix ruff PERF203 + PERF401 violations

[codacy-production]

Coverage summary from Codacy

Merging #43 (9688c97) into main (b568139) - See PR on Codacy

Coverage variation	Diff coverage
Report missing for b5681391	100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (b568139)	Report Missing	Report Missing	Report Missing
Head commit (9688c97)	1157	875	75.63%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#43)	2	2	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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Footnotes

1. Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct. ↩