Clean up slugs: lower-case, no-spaces

Alex Kalderimisrequested to merge
clean-up-slugs into master

Why is this change being made?

We aim to move towards separate files per team member, named after their slugs. See: !73139 (merged)

As a clean-up measure, this change ensures that all slugs are lower-case, and do not have spaces.

Author Checklist

  • Provided a concise title for the MR
  • Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
  • Assign this change to the correct DRI
    • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the "Maintained by" section in on the page being edited.
    • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
    • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files. (this requirement has been removed pending identification of a new DRI for the handbook)

/cc @leipert - as you suggested this /cc @lienvdsteen - peopleops will need to be aware of this too

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