[openstreetmap/openstreetmap-website] Increase may key and value max length (#2025)

[Yves Pratter]

We have the same issue with multi-valued keys like `website`, `wikimedia_commons`… if URL are (two) long.
Or with `subject:wikidata` i.e. for a memorial with a lot a persons.

> there's no technical reason for having a limit, but it serves as a reminder for people that tags are supposed to be human-readable

Editors could **warn** users but let them the choice to go beyond 255  😃 

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