Remove everything below nodes.title/nodes.subtitle from doctree?

Since I am already able to read the title/subtitle from the doctree, now I
want to be able to *remove* the title and subtitle from a doctree:

What would be the canonical way of doing that?

- Removing the nodes.title and nodes.subtitle from the doctree (how can
that be done? Is there any examples to how that works?)
- Removing all nodes *after* nodes.title and nodes.subtitle (any examples
for something like that?)

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