Update mainsite -> about -> applications

TextMaker seems to be deprecated for a decade or so
https://www.freshports.org/editors/softmaker-office/

LLVM has replaced the GCC nowadays

lang/icon is deprecated
https://www.freshports.org/lang/icon/

Approved by: Pau Amma, manu(mentor)

Differential revision: https://reviews.freebsd.org/D46646