fix(default-config): remove the preact challenge from the default config

Signed-off-by: Xe Iaso <me@xeiaso.net>

data/botPolicies.yaml

@@ -212,14 +212,10 @@ thresholds:
         - weight < 20
     action: CHALLENGE
     challenge:
-      # https://anubis.techaro.lol/docs/admin/configuration/challenges/preact
-      #
-      # This challenge proves the client can run a webapp written with Preact.
-      # The preact webapp simply loads, calculates the SHA-256 checksum of the
-      # challenge data, and forwards that to the client.
-      algorithm: preact
-      difficulty: 1
-      report_as: 1
+      # https://anubis.techaro.lol/docs/admin/configuration/challenges/proof-of-work
+      algorithm: fast
+      difficulty: 2 # two leading zeros, very fast for most clients
+      report_as: 2
   - name: mild-proof-of-work
     expression:
       all:
@@ -229,8 +225,8 @@ thresholds:
     challenge:
       # https://anubis.techaro.lol/docs/admin/configuration/challenges/proof-of-work
       algorithm: fast
-      difficulty: 2 # two leading zeros, very fast for most clients
-      report_as: 2
+      difficulty: 4
+      report_as: 4
   # For clients that are browser like and have gained many points from custom rules
   - name: extreme-suspicion
     expression: weight >= 30
@@ -238,5 +234,5 @@ thresholds:
     challenge:
       # https://anubis.techaro.lol/docs/admin/configuration/challenges/proof-of-work
       algorithm: fast
-      difficulty: 4
-      report_as: 4
+      difficulty: 6
+      report_as: 6