Deploy Dartdoc with GitHub Pages dependencies preinstalled

chore: update GitHub Actions configuration #7

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Summary
Jobs
- build
- deploy
Run details
- Usage
- Workflow file

Run time

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Job	Run time
build	1m 32s
build	1m 32s
build	1m 32s
deploy	1s
deploy	3s
deploy	2s
	4m 42s