fix(automations): remove webhook trigger to prevent duplicate work

The PULL_REQUEST_EVENT_MERGED webhook and */10 cron can fire
simultaneously, spawning two agents that both pick the same issue
before either marks it in-progress. This caused duplicate PRs for
issues #26 (PRs #45/#46) and #36 (PRs #40/#41).

The cron alone ensures work is picked up within 10 minutes.

Co-authored-by: Ona <no-reply@ona.com>

Author: zacharias-ona

.ona/automations/bug-fixer.yaml

@@ -1,14 +1,6 @@
 name: Bug Fixer
 description: Picks the next bug from GitHub Issues and fixes it autonomously.
 triggers:
-    - context:
-        projects:
-            projectIds:
-                - 019d8bf4-1ded-7317-be2f-555e8fb55ff9
-      pullRequest:
-        webhookId: 019d8d97-eb6e-70c4-a97d-25952abbc5a7
-        events:
-            - PULL_REQUEST_EVENT_MERGED
     - context:
         projects:
             projectIds:

.ona/automations/feature-builder.yaml

@@ -1,14 +1,6 @@
 name: Feature Builder
 description: Picks the next feature from the backlog and implements it autonomously.
 triggers:
-    - context:
-        projects:
-            projectIds:
-                - 019d8bf4-1ded-7317-be2f-555e8fb55ff9
-      pullRequest:
-        webhookId: 019d8d97-eb6e-70c4-a97d-25952abbc5a7
-        events:
-            - PULL_REQUEST_EVENT_MERGED
     - context:
         projects:
             projectIds: