Use the go meta-port instead of a hand-rolled go/gofmt symlink

FreeBSD's lang/go is a real meta-port (installs as package name "go")
that depends on whichever goNNN is current and installs the go/gofmt
symlinks itself, tracked and upgradeable - `pkg install go` replaces both
the go125 install and the manual `ln -sf` steps in one command. Verified
against a real base image and rebuild: same resulting symlinks, now
pkg-owned instead of orphaned files pkg doesn't know about.

Docs updated to check for an unversioned meta-port first, falling back to
a manual symlink only when a toolchain doesn't have one.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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