fix: rebase fix and dynamic head_ref for target branch

- so we checked that the rebase was actually stupid as it was rebasing to itself... Now it rebases to main
- also after validation of functioning with hardcoded target branch, let's switch to dynamic head_ref to make sure we actually push the docs to the current PR branch, whatever that may be.

Author: MihalyToth20

.github/workflows/add-docs-to-release.yml

@@ -30,8 +30,8 @@ jobs:
 
       - name: Fetch and rebase onto latest main
         run: |
-          git fetch origin changeset-release/main
-          git rebase origin/changeset-release/main
+          git fetch origin main
+          git rebase origin/main
 
       - name: Build packages
         run: pnpm build:packages
@@ -45,4 +45,4 @@ jobs:
           git config user.email "github-actions[bot]@users.noreply.github.com"
           git add docs
           git commit -m "chore: update docs [skip ci]" || echo "No changes to commit"
-          git push origin HEAD:changeset-release/main --force-with-lease
+          git push origin HEAD:${GITHUB_HEAD_REF} --force-with-lease