fix(typst): title block no longer takes the full width

[mcanouil]

Adjust the Typst template to ensure that titles and subtitles are centre-aligned in the rendered PDF.
block is still needed inside place to ensure 100% width is used.

place was introduced as a replacement of block instead of combining the two in

• c5d6e82

Fixes #14031

No changelog entry as the issue was introduced in 1.9.

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[cscheid]

(I'm just going to jump in and 👍 and merge this. Thank you!)

[gordonwoodhull]

Filed upstream here:

• typst: use both place and 100% width block for title jgm/pandoc#11472

They had the opposite problem:

• Quarto had place() but lost block(width: 100%)
• Pandoc had block(width: 100%) but lost place()