docs(sponsors): update section

Thanks to Speakeasy and LivePeer for their support over the years!

Author: jamietanna

README.md

@@ -4478,7 +4478,7 @@ Please consider sponsoring us through GitHub Sponsors either [on the organisatio
 
 See [this blog post from Tidelift](https://blog.tidelift.com/paying-maintainers-the-howto) for more details on how to talk to your company about sponsoring maintainers of (Open Source) projects you depend on.
 
-In addition, we are also generously sponsored by the following folks, each of whom provide sponsorship for 1 hour of work a month:
+We are also generously sponsored by the following folks, each of whom provide sponsorship for 1 hour of work a month:
 
 <p align="center">
 	<a href="https://www.devzero.io/lp/dev-environment?utm_campaign=github&utm_source=oapi-codegen%20repo&utm_medium=github%20sponsorship">
@@ -4490,30 +4490,10 @@ In addition, we are also generously sponsored by the following folks, each of wh
 	</a>
 </p>
 
-<p align="center">
-	<a href="https://sandbox.speakeasy.com/?s=iQ5hEdrjLCii&utm_source=oapi-codegen+repo&utm_medium=github+sponsorship">
-		<picture>
-		  <source media="(prefers-color-scheme: light)" srcset=".github/sponsors/speakeasy-light.svg">
-		  <source media="(prefers-color-scheme: dark)" srcset=".github/sponsors/speakeasy-dark.svg">
-		  <img alt="Speakeasy logo" src=".github/sponsors/speakeasy-dark.svg" height="60px">
-		</picture>
-	</a>
-</p>
-
 <p align="center">
 	<a href="https://cybozu.co.jp/?utm_source=oapi-codegen+repo&utm_medium=github+sponsorship">
 		<img alt="Cybozu logo" src=".github/sponsors/cybozu.svg" height="100px">
 	</a>
 </p>
 
-<p align="center">
-	<a href="https://livepeer.org/?utm_source=oapi-codegen+repo&utm_medium=github+sponsorship">
-		<picture>
-		  <source media="(prefers-color-scheme: light)" srcset=".github/sponsors/livepeer-light.svg">
-		  <source media="(prefers-color-scheme: dark)" srcset=".github/sponsors/livepeer-dark.svg">
-		  <img alt="Livepeer logo" src=".github/sponsors/livepeer-dark.svg" height="50px">
-		</picture>
-	</a>
-</p>
-
 (Note that the order of appearance the order in which sponsorship was received)