feat(openchallenges): increase headline char limit to 120

[vpchung]

Fixes #2320

Changelog

Backend

• increase headline varchar limit from 80 to 120 in SQL table creation
• update maxLength to 120 for ChallengeHeadline API spec
• update headlines in CSV dump file

Frontend

• decrease height of banner SVG's viewbox
• decrease banner's height on challenge card - this will allow the card to remain at its current size
• clamp headline at 3 lines (instead of 2)

Preview

API docs

Before

After

[vpchung]

Feedback from the stand-up:

• New design may have too much text
• New banner size may not be easy to work with in the future
• @tschaffter will try to generate new headlines up to 80 characters (whereas our current prompt is 10 words or less)

Closing PR now.