dev/builds: update sidebar links

We no longer use Cirrus. Add a couple more important GHA workflows, plus
a catch-all since there are now way too many to list them all. Add a
Test Clutch link.

dev/_builds.html

@@ -17,9 +17,12 @@
 <br><a href="https://ci.appveyor.com/project/curlorg/curl">AppVeyor CI builds</a>
 <br><a href="https://dev.azure.com/daniel0244/curl/_build/latest?definitionId=1&amp;branchName=master">Azure Pipelines</a>
 <br><a href="https://app.circleci.com/pipelines/github/curl/curl">CircleCI</a>
-<br><a href="https://cirrus-ci.com/github/curl/curl">Cirrus CI</a>
 <br><a href="https://github.com/curl/curl/actions/workflows/linux.yml">Github Actions (Linux)</a>
 <br><a href="https://github.com/curl/curl/actions/workflows/macos.yml">Github Actions (macOS)</a>
+<br><a href="https://github.com/curl/curl/actions/workflows/windows.yml">Github Actions (Windows)</a>
+<br><a href="https://github.com/curl/curl/actions/workflows/non-native.yml">Github Actions (other OSes)</a>
+<br><a href="https://github.com/curl/curl/actions/workflows/">Github Actions (even more)</a>
+<br><a href="https://testclutch.curl.se/">Test Clutch</a>
 </div>
 
 TITLE(Automatic Builds)