Add landing page schema / document type #663

Job	Run time
Test Manuals Publisher / Run RSpec	1m 53s
Test Publisher / Run Minitest	9m 24s
Test Search Admin / Run RSpec	1m 13s
Test Search API / Run RSpec	2m 4s
Test Service Manual Publisher / Run RSpec	1m 26s
Test Short URL Manager / Run RSpec	1m 13s
Test Smart Answers / Run Minitest	2m 2s
Test Specialist Publisher / Run RSpec	1m 47s
Test Travel Advice Publisher / Run RSpec	1m 29s
Test Whitehall / minitest-matrix (4, 0)	2m 56s
Test Whitehall / minitest-matrix (4, 1)	3m 3s
Test Whitehall / minitest-matrix (4, 2)	2m 51s
Test Whitehall / minitest-matrix (4, 3)	3m 27s
Test Whitehall / Run Minitest	1s
	34m 49s

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