rmport: fix and simplify workflow

- gather information about the deleted port for the commit message
  before removing the port. I somehow missed that when testing the
  script.
- Instead of a temporary branch, just operate on the current branch
  and incorporate upstream changes with git pull --rebase. This
  prevents one from being stranded on a temporary branch if the
  script crashes and oblivates the need for a squash merge [1]

Suggested by:	mat [1]

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