docs: add Vagrant-based development environment setup guide #236

Job	Run time
integration (standalone, deployment_standalone or all)	25m 33s
integration (insights, deployment_cloud or all)	13m 55s
integration (community, deployment_community)	12m 28s
integration (standalone, x_repo_search)	10m 9s
integration (standalone, iqe_rbac_test)	7m 29s
integration (certified-sync, sync)	4m 54s
integration (standalone, rbac_parallel_group_1)	20m 16s
integration (standalone, rbac_parallel_group_2)	9m 16s
	1h 44m 0s

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