chore(demo): replaced global b-demo-steps class with tui-setup component

[KrollikRoddzer]

Partially solves #6972

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BundleMon

Files updated (2)

Status	Path	Size	Limits
✅	demo/browser/runtime.(hash).js	38.08KB (+20B +0.05%)	+10%
✅	demo/browser/main.(hash).js	310.11KB (-12B 0%)	+10%

Unchanged files (3)

Status	Path	Size	Limits
✅	demo/browser/vendor.(hash).js	205.36KB	+10%
✅	demo/browser/styles.(hash).css	13.89KB	+10%
✅	demo/browser/polyfills.(hash).js	11.21KB	+10%

Total files change +8B 0%

Groups updated (1)

Status	Path	Size	Limits
✅	demo/browser/*..js	2.39MB (-7.72KB -0.31%)	-

Final result: ✅

View report in BundleMon website ➡️

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