devel/sedsed: update to 2.0.0

Update WWW and use github.
Update license (GPLv3).
Set NO_ARCH and NO_BUILD.

Changes: https://github.com/aureliojargas/sedsed/compare/v1.0...v2.0.0

PR: 277367
Approved by: Submitter is maintainer
Differential Revision: https://reviews.freebsd.org/D44802