Add badge column to the user guide levels table

Salim Zidanerequested to merge
gitlab-community/gitlab-org/developer-relations/contributor-success/contributors-gitlab-com:588/add-badge-column into main

What does this MR do and why?

Related to #588 (closed)

Adds badge column to the user guide levels table, making each level immediately recognizable.

Screenshots or screen recordings

Before After
image.png image.png

/cc @leetickett-gitlab

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