tempo: cleanup config template and remove demo values

roles/tempo/templates/config.yml.j2

@@ -20,9 +20,6 @@ distributor:
         http:
           endpoint: {{ wireguard_address }}:4318
 
-ingester:
-  max_block_duration: 5m               # cut the headblock when this much time passes. this is being set for demo purposes and should probably be left alone normally
-
 compactor:
   compaction:
     block_retention: 1h                # overall Tempo trace retention. set for demo purposes
@@ -41,9 +38,9 @@ metrics_generator:
 
 storage:
   trace:
-    backend: local                     # backend configuration to use
+    backend: local
     wal:
-      path: /var/lib/tempo/wal             # where to store the wal locally
+      path: /var/lib/tempo/wal
     local:
       path: /var/lib/tempo/blocks