Update executablebooks links to jupyter-book github org

Author: choldgraf

package.json

@@ -3,7 +3,7 @@
   "version": "0.0.5",
   "description": "MyST schema, testcases, and typescript types",
   "author": "Franklin Koch <[email protected]>",
-  "homepage": "https://github.com/executablebooks/myst-spec",
+  "homepage": "https://github.com/jupyter-book/myst-spec",
   "license": "MIT",
   "types": "dist/index.d.ts",
   "files": [
@@ -20,7 +20,7 @@
   },
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/executablebooks/myst-spec.git"
+    "url": "git+https://github.com/jupyter-book/myst-spec.git"
   },
   "scripts": {
     "build": "npm run clean && tsc index.ts && node index.js",
@@ -33,7 +33,7 @@
     "prepublishOnly": "npm run build;"
   },
   "bugs": {
-    "url": "https://github.com/executablebooks/myst-spec/issues"
+    "url": "https://github.com/jupyter-book/myst-spec/issues"
   },
   "devDependencies": {
     "@types/glob": "^7.2.0",