make wireless properly secret

base.nix

@@ -18,14 +18,15 @@
   # Add wifi credentials
   networking.wireless = {
     enable = true;
+    secretsFile = ./wireless.key;
     networks."PAL3.0".auth = ''
       eap=PEAP
       key_mgmt=WPA-EAP
       pairwise=CCMP
       auth_alg=OPEN
       proto=RSN
-      identity="USERNAME@purdue.edu"
-      password="PASSWORD"
+      identity=ext:identity
+      password=ext:password
       phase1="peaplabel=0"
       phase2="auth=MSCHAPV2"
     '';