cases: reapply custom meta title and h1 format (data versioning tutorial) [SEO]

[jeremydesroches]

Reapplies "Tutorial:" prefix to meta title and H1, as discussed in #1856.

Also fixes typo: "...reading the François' tutorial itself." -> "...reading François' tutorial itself."

[jeremydesroches]

Final check on this as requested for GSoD, @jorgeorpinel:

Tutorial: Data Versioning - Link - As with closely-related #1856, improved across all four metrics and increased traffic from "long tail" terms. Above link adjusted to only a four-week period before/after merge (runs up against current date).

Notable increases in clicks for terms "dataset versioning", "model versioning", and "how to use DVC" (which also increased clickthrough from 0.9% to 13.5% 😳 )

[jorgeorpinel]

@jeremydesroches I aligned the weeks in data comparisons and posted some screenshots of the results in previous reports. Would you like to continue doing that in the remaining ones? Keeping in mind that this repo is public (unlike our Search Console) so hopefully having some figures and example results here can be useful for you as evidence of the impact of your contributions.

[jeremydesroches]

Would you like to continue doing that in the remaining ones?

Thanks @jorgeorpinel. Good idea and I'll do that on the remaining ones. (Update: added above.)