[docs] Remove performance link (#29344)

**Description:** close
#29341
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->

**Link to tracking Issue:** <Issue number if applicable>

**Testing:** <Describe what testing was performed and which tests were
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**Documentation:** <Describe the documentation added.>

---------

Co-authored-by: Curtis Robert <crobert@splunk.com>

README.md

@@ -34,11 +34,8 @@
       •  
     <a href="https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/monitoring.md">Monitoring</a>
     &nbsp;&nbsp;&bull;&nbsp;&nbsp;
-    <a href="https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/performance.md">Performance</a>
-    &nbsp;&nbsp;&bull;&nbsp;&nbsp;
     <a href="https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/security-best-practices.md">Security</a>
     &nbsp;&nbsp;&bull;&nbsp;&nbsp;
-    <a href="https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/roadmap.md">Roadmap</a>
   </strong>
 </p>