Add to transform Volto blocks into list to make them support GraphQL

[datakurre]

WIP.

This would need documentation and examples on how render Volto blocks using components from plone/volto.

[coveralls]

Pull Request Test Coverage Report for Build 897

• 47 of 72 (65.28%) changed or added relevant lines in 10 files are covered.
• 59 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+3.7%) to 38.484%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/util/createWebsocketEvent.js	0	2	0.0%
src/util/deleteWebSocketEvent.js	0	2	0.0%
src/util/normalizeData.js	16	19	84.21%
src/util/modifiedWebSocketEvent.js	0	4	0.0%
src/util/makeContentNode.js	23	28	82.14%
src/gatsby-node.js	0	9	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/util/normalizeData.js	1	86.21%
src/gatsby-node.js	58	1.08%

Totals
Change from base Build 879:	3.7%
Covered Lines:	168
Relevant Lines:	418

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💛 - Coveralls