Update render-all.yml

disabling coursera / leanpub rendering for now

.github/workflows/render-all.yml

@@ -90,6 +90,7 @@ jobs:
           git push -u origin main  || echo "No changes to push"
 
   render-tocless:
+    if: false
     name: Render TOC-less version for Leanpub or Coursera
     needs: [yaml-check, render-bookdown]
     runs-on: ubuntu-latest
@@ -130,6 +131,7 @@ jobs:
           git push -u origin main  || echo "No changes to push"
 
   render-leanpub:
+    if: false
     name: Finish Leanpub prep
     needs: [yaml-check, render-tocless]
     runs-on: ubuntu-latest
@@ -207,6 +209,7 @@ jobs:
           git push --force --set-upstream origin main || echo "No changes to push"
 
   render-coursera:
+    if: false
     name: Finish Coursera prep
     needs: [yaml-check, render-tocless]
     runs-on: ubuntu-latest