gentle git gone script

This is a non-forcible branch clean up script.
It is also an alternative to git_branchcleanup.nu

My first inclination was to put this in cool_oneliners because it is
one. But then I saw we have a few git scripts so wanted to follow them.

It raises the general question: should one liners be their own category
or can we derive an index of one liners, searched and sorted by topic?

git/git_gone.nu

@@ -0,0 +1,3 @@
+# gently try to delete merged branches, excluding the checked out one
+# This is an alternative to git_branchcleanup.nu
+git branch --merged | lines | where $it !~ '*' | str trim | where $it != 'master' && $it != 'main' | each { git branch -d $it }