Add delete snippets

snippets/delete-detached-branches.md

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+---
+title: Delete detached branches
+tags: repository,branch,intermediate
+---
+
+Deletes all detached branches.
+
+- Use `git fetch --all --prune` to garbage collect any detached branches.
+- This is especially useful if the remote repository is set to automatically delete merged branches.
+
+```sh
+git fetch --all --prune
+```
+
+```sh
+git checkout master
+git branch
+# master
+# patch-1
+# patch-2
+
+# Assuming `patch-1` is detached
+git fetch --all --prune
+
+git branch
+# master
+# patch-2
+```