Disable Arm32 Builds (#1325)

Disables Arm32 builds and removes mention of the build option in the README.

scripts/install.sh

@@ -50,14 +50,14 @@ ARCH_NAME=""
 if [ "$ARCH" = "aarch64" ]; then
   ARCH_NAME="linuxarm64"
 elif [ "$ARCH" = "armv7l" ]; then
-  ARCH_NAME="linuxarm32"
+  echo "ARM32 is not supported by PhotonVision. Exiting."
+  exit 1
 elif [ "$ARCH" = "x86_64" ]; then
   ARCH_NAME="linuxx64"
 else
   if [ "$#" -ne 1 ]; then
       echo "Can't determine current arch; please provide it (one of):"
       echo ""
-      echo "- linuxarm32 (32-bit Linux ARM)"
       echo "- linuxarm64 (64-bit Linux ARM)"
       echo "- linuxx64   (64-bit Linux)"
       exit 1