docs: add Vagrant-based development environment setup guide #237

Job	Run time
integration (standalone, deployment_standalone or all)	25m 42s
integration (insights, deployment_cloud or all)	14m 5s
integration (community, deployment_community)	12m 32s
integration (standalone, x_repo_search)	10m 3s
integration (standalone, iqe_rbac_test)	7m 30s
integration (certified-sync, sync)	4m 52s
integration (standalone, rbac_parallel_group_1)	20m 54s
integration (standalone, rbac_parallel_group_2)	10m 18s
	1h 45m 56s

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