Blog: Announcing 17.0 page URL deprecations

Why this change?

The url structure represents the site map, and it should be both predictable and consistent. URLs visualize the site structure. The farther the path deviates from the page name, the less useful they become. The challenge is that it also should be stable, which is why we are announcing this change far in advance of 17.0. Over the years page titles have began to deviate from their original designation.

Related gitlab-org/gitlab#390591, Closes #34436 (closed)

Checklist for writer

• Link to issue added, and set to close when this MR is merged
• Due date and marketing milestone (e.g. Mktg: 2021-03-28) added to title for the desired publish date
• If time sensitive
  • Added ~"priority" label if blog needs to run in the next few days
  • Mentioned @sgittlen to give her a heads up ASAP
• Blog post file formatted correctly, including uploading and embedding in markdown any accompanying images
• All relevant frontmatter included
• Review app checked for any formatting issues
• Reviewed by fellow team member(s)
• Reviewer(s) marked approved before sending to blog team
  • Any required internal or external approval for this blog post has been granted (please leave a comment with details)
  • Reviews by Legal team if necessary according to SAFE guidelines
• Assign to @Sgittlen for final review

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