Ignore Jekyll local dev artifacts #373

Job	Run time
Lint vitals (Foss, Release, app)	2m 56s
Unit tests (Debug, testGplay)	3m 10s
Fastlane metadata	8s
Lint vitals (Gplay, Release, app)	3m 10s
Build apps (Foss, Debug, app)	4m 9s
Unit tests (Debug, testFoss)	3m 42s
Build apps (Gplay, Debug, app)	4m 39s
Lint vitals (Gplay, Beta, app)	3m 2s
Lint vitals (Foss, Beta, app)	3m 2s
	27m 58s

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