Update CONTRIBUTING.md to remove star history chart

Removed star history chart from contributing guidelines.

Author: RubenHalman

CONTRIBUTING.md

@@ -1,7 +1,5 @@
 ## Contributing Guidelines
 
-[![Star History Chart](https://app.repohistory.com/api/svg?repo=Flow-Scanner/lightning-flow-scanner&type=Date&background=0D1117&color=f86262)]([https://app.repohistory.com/star-history](https://activity.lightningflowscanner.org))
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 Since 2021, the _Lightning Flow Scanner_ has grown from its roots as VS Code tool to empower Salesforce Developers across six free and open-source platforms—from developer tools to native Salesforce App—delivering a unified experience for robust static analysis of Flows. [Our dedicated community](https://activity.lightningflowscanner.org/) has shared their expertise to deepen understanding of Flow optimization. Your support can amplify our impact. Here’s how you can contribute:
 
 - 💬 Share feedback to help us improve.