Add specification for view-only notebook

Author: krassowski

schema/plugin.json

@@ -6,11 +6,63 @@
   "properties": {},
   "additionalProperties": false,
   "jupyter.lab.toolbars": {
-    "Notebook": [
+    "ViewOnlyNotebook": [
       {
         "name": "save",
+        "disabled": true
+      },
+      {
+        "name": "cut",
+        "command": "notebook:cut-cell",
+        "disabled": true
+      },
+      {
+        "name": "copy",
+        "command": "notebook:copy-cell",
+        "disabled": true
+      },
+      {
+        "name": "paste",
+        "command": "notebook:paste-cell-below",
+        "disabled": true
+      },
+      {
+        "name": "run",
+        "caption": "Run cell",
+        "disabled": true
+      },
+      {
+        "name": "interrupt",
+        "caption": "Interrupt notebook",
+        "disabled": true
+      },
+      {
+        "name": "restart",
+        "caption": "Restart notebook",
+        "disabled": true
+      },
+      {
+        "name": "restart-and-run",
+        "caption": "Restart and run all cells",
+        "disabled": true
+      },
+      {
+        "name": "cellType",
         "command": "",
-        "disabled": true,
+        "disabled": true
+      },
+      {
+        "name": "share",
+        "rank": 35
+      },
+      {
+        "name": "downloadDropdown",
+        "rank": 36
+      }
+    ],
+    "Notebook": [
+      {
+        "name": "save",
         "rank": 10
       },
       {