* Actually filter out missing interpreters
This fixes https://github.com/pypa/pipenv/issues/5261.
Before this change, I would get a "The Python interpreter can't be
found" error when running `pipenv install --system` with a python3 but
no python.
- Comment out the vendor directory section so it doesn't show up all the time in prs
- Minor grammar and spelling changes
- Warn users that we will close PRs with no issue or explanation about what they are solving
Jeremy Fleischman