fix: update broken enterprise link on installation page (OSS-36) (#5443)

* fix: update broken enterprise link on installation page (OSS-36)

The 'Explore Enterprise Options' card on the installation page linked to
https://crewai.com/enterprise which returns a 404. Updated the href to
https://crewai.com/amp across all locales (en, pt-BR, ko, ar).

* fix: use HubSpot form link for enterprise options card

Updated per team feedback — the enterprise card should link to the
HubSpot demo form instead of crewai.com/amp.

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Co-authored-by: Lorenze Jay <63378463+lorenzejay@users.noreply.github.com>