Removes navigation settings that are not used by Volto #14941

Job	Run time
Core Blocks (18.x)	7m 39s
Core Blocks (20.x)	7m 45s
Core Control Panels (18.x)	4m 57s
Core Control Panels (20.x)	4m 4s
Core Basic (18.x)	6m 38s
Core Basic (20.x)	6m 28s
Core Basic - Plone 5 (18.x)	6m 49s
Core Blocks - Listing (18.x)	5m 11s
Core Content (18.x)	3m 27s
Coresandbox (18.x)	4m 32s
Core Content (20.x)	3m 17s
Core Blocks - Listing (20.x)	5m 4s
Core Volto Slate (18.x)	7m 53s
Project Generator (18.x)	7m 4s
Core Volto Slate (20.x)	7m 3s
Project Generator (20.x)	7m 18s
Multilingual (18.x)	3m 52s
Multilingual in Seamless Mode (18.x)	3m 51s
Seamless Mode (18.x)	6m 30s
Working Copy (18.x)	3m 34s
	1h 52m 56s

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