_content: replace opentracing with opentelemetry

OpenTracing has been deprecated/archived per their github/website.
Replace with the recommended replacement of OpenTelemetry.

Fixes golang/go#53036

Change-Id: Ic7106484ab9ca53e6f199eb48d275dd81ab0d63a
Reviewed-on: https://go-review.googlesource.com/c/website/+/421894
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>

_content/resources.yaml

@@ -52,9 +52,9 @@
     iconDark: /images/icons/gear-dark.svg
     iconName: Sphere
     packages:
-    - title: opentracing/opentracing-go
-      url: https://github.com/opentracing/opentracing-go
+    - title: open-telemetry/opentelemetry-go
+      url: https://github.com/open-telemetry/opentelemetry-go
     - title: istio/istio
       url: https://github.com/istio/istio
     - title: urfave/cli
-      url: https://github.com/urfave/cli
+      url: https://github.com/urfave/cli

_content/solutions/devops.md

@@ -145,9 +145,9 @@ Go’s garbage collector means DevOps/SRE teams don’t have to worry about memo
   - title: Monitoring and tracing
     viewMoreUrl: https://pkg.go.dev/search?q=tracing
     items:
-      - text: opentracing/opentracing-go
-        url: https://pkg.go.dev/github.com/opentracing/opentracing-go?tab=overview
-        desc: Vendor-neutral APIs and instrumentation for distributed tracing
+      - text: open-telemetry/opentelemetry-go
+        url: https://pkg.go.dev/go.opentelemetry.io/otel
+        desc: Vendor-neutral APIs and instrumentation for monitoring and distributed tracing
       - text: jaegertracing/jaeger-client-go
         url: https://pkg.go.dev/github.com/jaegertracing/jaeger-client-go?tab=overview
         desc: An open source distributed tracing system developed by Uber formats