Add pip command to install Python dependencies

[n-jay]

Link the issue(s) this pull request is related to. Related discussion can be found on the dev mailing list thread linked here.

Summarize your change. Add command for OpenCue Python dependency installation on Ubuntu (and other Debian-based distros) via pip.

Existing documentation setup instructions via PyCharm IDE, which can result in some dependencies not being setup correctly.

[bcipriano]

@n-jay This PR is marked as a draft, is it ready for review? Just checking.

[n-jay]

yes @bcipriano, it's ready for review. Sent a draft assuming its standard protocol as per contributor instructions doc. Sorry for the confusion.

[n-jay]

@bcipriano something else I noticed in the doc were 2 redundant pip commands: https://github.com/AcademySoftwareFoundation/opencue.io/blob/df4cfa26b63c60dc1af2ab57a58100399c4974b3/content/contributing/opencue/Getting%20started/getting-started-linux.md?plain=1#L265

https://github.com/AcademySoftwareFoundation/opencue.io/blob/df4cfa26b63c60dc1af2ab57a58100399c4974b3/content/contributing/opencue/Getting%20started/getting-started-linux.md?plain=1#L285 They're present in the mac version as well.

These are used after the pip install -r is run when the 2 dependencies have already been set up. It's a super minor detail so it would be convenient if we can address it in this same PR instead of creating a fresh one.

[bcipriano]

Agreed, you can go ahead and remove those redundant installs in this PR.

[n-jay]

@bcipriano done