[fr] Enable link checking, and normalize links, add missing

[chalin]

• Contributes to #3190
• Normalizes links, adding a trailing slash, as reported by the link checker
• Adds a missing link to the containerization page -- so as to match the English base language version of the page
• There are no other changes. Paragraphs were line-wrapped à la Prettier.

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[chalin]

@nate-double-u - what is the process here? How many approvals are required?

[Krast76]

@nate-double-u - what is the process here? How many approvals are required?

We can't merge into main. If you change the target branch from main to dev-fr we'll have the rights to do so.