dev(dev-shell): improvements to dev shell env

Makefile

@@ -61,6 +61,7 b' dev-sh:'
 	sudo echo "deb [trusted=yes] https://apt.fury.io/rsteube/ /" | sudo tee -a "/etc/apt/sources.list.d/fury.list"
 	sudo apt-get update
 	sudo apt-get install -y zsh carapace-bin
+	rm -rf /home/rhodecode/.oh-my-zsh
 	curl https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh | sh
 	echo "source <(carapace _carapace)" > /home/rhodecode/.zsrc
 	PROMPT='%(?.%F{green}√.%F{red}?%?)%f %B%F{240}%1~%f%b %# ' zsh
@@ -78,8 +79,7 b' dev-env:'
 .PHONY: sh
 ## shortcut for make dev-sh dev-env
 sh:
-	make dev-sh
-	make dev-env
+	(make dev-env; make dev-sh)
 
 
 .PHONY: dev-srv