Unlink saasbo tutorials

Summary:
They require a botorch release, which we don't want to wait for to release
They failed in the laster release [here](https://github.com/facebook/Ax/runs/3291884796?check_suite_focus=true#step:5:498) and [here](https://github.com/facebook/Ax/runs/3291884796?check_suite_focus=true#step:5:644)

Removing them from `tutorials.json` will prevent `make_tutorials.py` from [discovering them](https://www.internalfb.com/code/fbsource/[cea1e232abc4]/fbcode/ax/scripts/make_tutorials.py?lines=72)

Reviewed By: ldworkin

Differential Revision: D30223576

fbshipit-source-id: ecfe72e0befc366ecf6e03c97b96140c1c425e6b

website/tutorials.json

@@ -47,14 +47,6 @@
     {
       "id": "multiobjective_optimization",
       "title": "Multi-Objective Optimization"
-    },
-    {
-      "id": "saasbo",
-      "title": "High-Dimensional Bayesian Optimization with Sparse Axis-Aligned Subspaces (SAASBO)"
-    },
-    {
-      "id": "saasbo_nehvi",
-      "title": "Fully Bayesian, High-Dimensional, Multi-Objective Optimization"
     }
   ],
   "Field Experiments": [