Remove WWW entries moved into port Makefiles
Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.
This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.
Approved by: portmgr (tcberner)
misc/cmatrix: Move to a more appropriate category
Approved by: eduardo (maintainer)
Approved by: philip (mentor), 0mp (mentor)
Differential Revision: https://reviews.freebsd.org/D33563