Link the Pivotal Tracker story with `geordi commit`

[makmic]

The geordi commit currently creates a commit with the following format if PT is connected:

title: "[##{story.id}] #{story.name}"

I suggest to add a direct link to the PT story within the commit description/body such as this:

title: [#123456] Reduce test flakyness
description: Story: https://www.pivotaltracker.com/story/show/123456

This brings various improvements:

• The merge request reviewer can easily access the story
• Fellow programmers get more context to a commit without searching for the story ID
• GitLab seems to prefer commits with a description

[codener]

Why not :+1: I'll discuss it with the team and let you know our decision.

[codener]

We'll add it :+1: