[website] Improve utm_source strategy

See https://blend.travel/blog/why-we-dont-always-tag-referrer-traffic-and-when-you-should/ for why.
If no utm_source param is used, it will use mui.com so we might as well use the same value to
avoid duplicate in people's reports.

README.md

@@ -58,8 +58,8 @@ View the [Joy UI documentation](https://mui.com/joy-ui/getting-started/).
 ### Diamond 💎
 
 <p>
-  <a href="https://octopus.com/?utm_source=MUI&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="128" width="128" src="https://mui.com/static/sponsors/octopus-square.svg" alt="octopus" title="Repeatable, reliable deployments" loading="lazy" /></a>
-  <a href="https://www.doit.com/?utm_source=MUI&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="128" width="128" src="https://mui.com/static/sponsors/doit-square.svg" alt="doit" title="Management Platform for Google Cloud and AWS" loading="lazy" /></a>
+  <a href="https://octopus.com/?utm_source=mui.com&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="128" width="128" src="https://mui.com/static/sponsors/octopus-square.svg" alt="octopus" title="Repeatable, reliable deployments" loading="lazy" /></a>
+  <a href="https://www.doit.com/?utm_source=mui.com&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="128" width="128" src="https://mui.com/static/sponsors/doit-square.svg" alt="doit" title="Management Platform for Google Cloud and AWS" loading="lazy" /></a>
 <a href="https://www.marblism.com/?utm_source=mui" rel="noopener sponsored" target="_blank"><img height="128" width="128" src="https://mui.com/static/sponsors/marblism-square.svg" alt="marblism" title="AI web app generation" loading="lazy" /></a>
 </p>
 
@@ -71,20 +71,20 @@ via [Open Collective](https://opencollective.com/mui-org) or via [Patreon](http
 
 <p>
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-  <a href="https://route4me.com/?utm_source=MUI&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="96" width="96" src="https://images.opencollective.com/route4me/71fb6fa/avatar/288.png" alt="Route4Me" title="Route4Me: Trusted last mile route planning and route optimization." loading="lazy" /></a>
+  <a href="https://www.text-em-all.com/?utm_source=mui.com&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img src="https://avatars.githubusercontent.com/u/1262264?s=288" alt="text-em-all.com" title="Text-em-all: Mass text messaging and automated calling." height="96" width="96" loading="lazy"></a>
+  <a href="https://megafamous.com/?utm_source=mui.com&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="96" width="96" src="https://mui.com/static/sponsors/megafamous.png" alt="megafamous.com" title="MegaFamous: Buy Instagram followers and likes." loading="lazy" /></a>
+  <a href="https://www.dialmycalls.com/?utm_source=mui.com&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="96" width="96" src="https://images.opencollective.com/dialmycalls/f5ae9ab/avatar/288.png" alt="dialmycalls.com" title="DialMyCalls: Send text messages, calls, and emails." loading="lazy" /></a>
+  <a href="https://goread.io/?utm_source=mui.com&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="96" width="96" src="https://images.opencollective.com/goread_io/eb6337d/logo/288.png" alt="goread.io" title="Goread.io: Instagram followers, likes, views, and comments." loading="lazy" /></a>
+  <a href="https://copycopter.ai/?utm_source=mui.com&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="96" width="96" src="https://images.opencollective.com/copycopterai/e167216/logo/288.png" alt="copycopter.ai" title="CopyCopter: Turn prompts into videos at ultra speed." loading="lazy" /></a>
+  <a href="https://route4me.com/?utm_source=mui.com&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank"><img height="96" width="96" src="https://images.opencollective.com/route4me/71fb6fa/avatar/288.png" alt="Route4Me" title="Route4Me: Trusted last mile route planning and route optimization." loading="lazy" /></a>
 </p>
 
 <p>
-  <a href="https://buzzoid.com/?utm_source=MUI&utm_medium=referral&utm_content=readme" rel="noopener sponsored" target="_blank" style="margin-right:8px;" ><img height="24" width="26" src="https://images.opencollective.com/buzzoidz/d23d9bb/logo/24.png" srcset="https://images.opencollective.com/buzzoidz/d23d9bb/logo/72.png 3x" alt="buzzoid.com" title="Buzzoid: Instant delivery Instagram followers." loading="lazy" style="margin-right:8px;" />Buzzoid</a>
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 </p>
 
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