docs: update code search link to new format

Author: DenverCoder1

README.md

@@ -10,7 +10,7 @@
 </p>
 
 <p align="center">
-  <a href="https://github.com/search?q=extension%3Amd+%22github+readme+streak+stats+herokuapp%22&type=Code" alt="Users" title="Repo users">
+  <a href="https://github.com/search?q=path%3A*.md+%28streak-stats.demolab.com+OR+git.io%2Fstreak-stats+OR+denvercoder1%2Fgithub-readme-streak-stats+OR+github-readme-streak-stats-eight.vercel.app%29&type=code" alt="Users" title="Repo users">
     <img src="https://freshidea.com/jonah/app/github-search-results/streak-stats"/></a>
   <a href="https://discord.gg/fPrdqh3Zfu" alt="Discord" title="Dev Pro Tips Discussion & Support Server">
     <img src="https://img.shields.io/discord/819650821314052106?color=7289DA&logo=discord&logoColor=white&style=for-the-badge"/></a>