adding redirects for Enforce events docs (#1622)

## Type of change
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quick PR to add some redirects for the old Enforce-related Events docs.
This PR will redirect those URLs to the cloud events bucket.

### What should this PR do?
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### Why are we making this change?
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[slack
context](https://chainguard-dev.slack.com/archives/C03H64P08UT/p1718398508911179)

### What are the acceptance criteria? 
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criteria. -->
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add them. -->

### How should this PR be tested?
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I tested this locally and it all works just fine. Not sure how to easily
test out the redirects but I might be helpful in talking one through it
if desired.

Signed-off-by: Mark Drake <mark@chainguard.dev>

nginx.conf

@@ -41,6 +41,9 @@ http {
         "~^/chainguard/chainguard-enforce/administration/connecting-to-private-registries/(.+)?$" /chainguard/chainguard-enforce/authentication/connecting-to-private-registries/;
         "~^/chainguard/chainguard-enforce/administration/annotation-based-caching/(.+)?$" /chainguard/chainguard-enforce/annotation-based-caching/;
         "~^/chainguard/chainguard-images/comparing-images/using-the-image-diff-api/(.+)?$" /chainguard/chainguard-images/comparing-images/;
+        "~^/chainguard/administration/cloudevents/create-github-issues/(.+)?$" /chainguard/administration/cloudevents/;
+        "~^/chainguard/administration/cloudevents/create-jira-issues/(.+)?$" /chainguard/administration/cloudevents/;
+        "~^/chainguard/administration/cloudevents/create-slack-alerts/(.+)?$" /chainguard/administration/cloudevents/;
 
         # complete content directory redirects here
         "~^/chainguard/chainguard-enforce/events/(.+)$" /chainguard/chainguard-enforce/cloudevents/$1;