ditch the Node matrix in CI

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #409 will degrade performances by 10.21%

_{Comparing ditch-node-matrix (b533ed8) with master (14bcc29)}

Summary

❌ 1 (👁 1) regressions

Benchmarks breakdown

	Benchmark	master	ditch-node-matrix	Change
👁	css-tricks-20231008.css (112.7kB)	451.6 ms	502.9 ms	-10.21%

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.55%. Comparing base (14bcc29) to head (b533ed8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #409 +/- ## ======================================= Coverage 99.55% 99.55% ======================================= Files 18 18 Lines 2260 2260 ======================================= Hits 2250 2250 Misses 10 10 ```

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[bartveneman]

closes #408