Remove Phoronix Test Suite

Drops the optional RUN_PTS group, the pts-core phase, and every Phoronix
reference from the scripts and docs. The suite is now just PassMark, the
bundled llama.cpp, the app workloads, and the quick tools.

capture-specs.sh

@@ -53,7 +53,7 @@ disks() {
 }
 tool_versions() {
   for c in 7z openssl fio stress-ng sysbench sensors turbostat cpupower \
-           glmark2 vkmark glxinfo vulkaninfo phoronix-test-suite python3 \
+           glmark2 vkmark glxinfo vulkaninfo python3 \
            libreoffice inkscape gegl gimp; do
     have "$c" && printf '    %-20s %s\n' "$c" "$("$c" --version 2>&1 | head -1)"
   done