FreeBSD/doc f1ac792 (r52848)en_US.ISO8859-1/htdocs/projects summerofcode.xml

Update to GSoC 2019.

Drop mention of SVN and Perforce in favor of using github.  If students
are familiar with anything it's going to be git.

Comment out text on gsoc flyers until someone makes an updated one.

Reported by:    bz
Reviewed by:    mmokhi
Differential Revision:  https://reviews.freebsd.org/D19505
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+19-18en_US.ISO8859-1/htdocs/projects/summerofcode.xml
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