Easily remove storyboard of a fresh Xcode 11.3.1+ project and do all your layout in code.

rm-storyboard.sh

if [ $# -eq 0 ]
  then echo 'No project name supplied'; exit 0
fi


# 1) Add necessary Code to SceneDelegate
a='guard let _ = (scene as? UIWindowScene) else { return }'

b='guard let windowScene = (scene as? UIWindowScene) else { return }\
        window = UIWindow()\
        window?.windowScene = windowScene\
        window?.rootViewController = ViewController()\
        window?.makeKeyAndVisible()'

sed -i '' "s/$a/$b/" $1/$1/SceneDelegate.swift

# 2) Delete Information from Info.plist
sed -i '' -e '/UIMainStoryboardFile/ {
$!N
d
}' -e '/UISceneStoryboardFile/ {
$!N
d
}' $1/$1/Info.plist

# 3) Delete Storyboard
rm $1/$1/Base.lproj/Main.storyboard

# 4) Delete references to Main.storyboard
sed -i '' -e '/Main.storyboard in Resources/d' -e '/Main.storyboard \*\/,/d' -e '/Base.lproj\/Main.storyboard/d' -e '/Main.storyboard \*\/ =/ {
$!N
$!N
$!N
$!N
$!N
$!N
$!N
d
}' $1/$1.xcodeproj/project.pbxproj