test

Separate /learn into its own nav #6906

Job	Run time
Build site and check links	3m 47s
Analyze and test code examples (Stable channel, stable, true)	7m 4s
Validate Firebase configuration	23s
Check if code excerpts are up to date	23s
Analyze and test code examples (Beta channel, beta, false)	7m 48s
	19m 25s

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