feat(notebooks): raise short title limit to 80 characters

[SylvainChevalier]

Closes #4727

Summary

Raise the notebook short_title max length from 60 to 80 characters in notebook_form.tsx.

Notes

• question_form.tsx and group_form.tsx already use max(80) on short_title on main, so no changes were needed there.
• The DB column Post.short_title is max_length=2000, and no DRF serializer adds a length validator, so no backend changes are needed.

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[SylvainChevalier]

lgtm