Use consistent bash5 style for conditionals and quoting

install/config/hardware/nvidia.sh

@@ -1,6 +1,6 @@
 NVIDIA="$(lspci | grep -i 'nvidia')"
 
-if [ -n "$NVIDIA" ]; then
+if [[ -n $NVIDIA ]]; then
   # Check which kernel is installed and set appropriate headers package
   KERNEL_HEADERS="$(pacman -Qqs '^linux(-zen|-lts|-hardened)?$' | head -1)-headers"
 
@@ -14,7 +14,7 @@ if [ -n "$NVIDIA" ]; then
     GPU_ARCH="maxwell_pascal_volta"
   fi
   # Bail if no supported GPU
-  if [ -z "${PACKAGES+x}" ]; then
+  if [[ -z ${PACKAGES+x} ]]; then
     echo "No compatible driver for your NVIDIA GPU. See: https://wiki.archlinux.org/title/NVIDIA"
     exit 0
   fi
@@ -32,7 +32,7 @@ MODULES+=(nvidia nvidia_modeset nvidia_uvm nvidia_drm)
 EOF
 
   # Add NVIDIA environment variables based on GPU architecture
-  if [ "$GPU_ARCH" = "turing_plus" ]; then
+  if [[ $GPU_ARCH = "turing_plus" ]]; then
     # Turing+ (RTX 20xx, GTX 16xx, and newer) with GSP firmware support
     cat >>"$HOME/.config/hypr/envs.conf" <<'EOF'
 
@@ -41,7 +41,7 @@ env = NVD_BACKEND,direct
 env = LIBVA_DRIVER_NAME,nvidia
 env = __GLX_VENDOR_LIBRARY_NAME,nvidia
 EOF
-  elif [ "$GPU_ARCH" = "maxwell_pascal_volta" ]; then
+  elif [[ $GPU_ARCH = "maxwell_pascal_volta" ]]; then
     # Maxwell/Pascal/Volta (GTX 9xx/10xx, GT 10xx, Quadro P/M/GV, MX series, Titan X/Xp/V) lack GSP firmware
     cat >>"$HOME/.config/hypr/envs.conf" <<'EOF'