fix(docs): Fixes SysGears logo in the README and SysGears name spelli…

…ng (#6245)

**What's the problem this PR addresses?**
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At the moment the image to SysGears logo is broken, because the URL has
changed to the `sysgears.com` domain from `cdn3.sysgears.com` subdomain.

**How did you fix it?**
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I have updated the URL to the logo to point at GitHub, so that Yarn
weren't affected by external website changes. I also updated spelling of
the SysGears name from Sysgears to SysGears, as the latter is more
correct.

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- [x] I have read the [Contributing
Guide](https://yarnpkg.com/advanced/contributing).

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README.md

@@ -74,11 +74,11 @@ Yarn is a modern package manager split into various packages. Its novel architec
   <tr>
     <td>
       <a href="https://sysgears.com/">
-        <img src="https://cdn3.sysgears.com/images/logo-128bacee32b1c70b00b6454397eeedc5.svg" width="140"/>
+        <img src="https://github.com/yarnpkg/berry/assets/1259926/c4d46d45-4f45-4b20-811e-d1f9d9e452dd" width="140"/>
       </a>
     </td>
     <td>
-      <b><a href="https://sysgears.com/">Sysgears</a></b> also sponsored time from very early in the 2.x development. In particular, their strong investment is the reason why Yarn 2 supports node_modules installs even better than it used to.
+      <b><a href="https://sysgears.com/">SysGears</a></b> also sponsored time from very early in the 2.x development. In particular, their strong investment is the reason why Yarn 2 supports node_modules installs even better than it used to.
     </td>
   </tr>
   <tr>