textproc/rubygem-compass-blueprint: Remove obsoleted port

This port depends on unsupported textproc/rubygem-compass.

Maintainer is informed via mail but it's rejected.
<t.zuehlsdorff@anymotion.de>: host

anymotion-de.mail.protection.outlook.com[104.47.4.36] said: 550 5.4.1
Recipient address rejected: Access denied. AS(201806281)
[AM5EUR02FT052.eop-EUR02.prod.protection.outlook.com] (in reply to RCPT TO
command)

Reference: https://github.com/Compass/compass/commit/dd74a1cfef478a896d03152b2c2a3b93839d168e