Revert "Prepare release/26.04"

This reverts commit 6990cae.

Author: AyodeAwe

README.md

@@ -31,7 +31,7 @@ Not all projects need that, so they sometimes invoke the workflow like this:
 ```yaml
 wheel-build-nx-cugraph:
   secrets: inherit
-  uses: rapidsai/shared-workflows/.github/workflows/wheels-build.yaml@release/26.04
+  uses: rapidsai/shared-workflows/.github/workflows/wheels-build.yaml@main
   with:
     build_type: pull-request
     script: ci/build_wheel_nx-cugraph.sh
@@ -87,7 +87,7 @@ You could do something like the following:
 
 ```yaml
 wheel-tests:
-  uses: rapidsai/shared-workflows/.github/workflows/wheels-test.yaml@release/26.04
+  uses: rapidsai/shared-workflows/.github/workflows/wheels-test.yaml@main
   with:
     script: ci/test_wheel.sh
   secrets: