Update docsy (hugo theme) git submodule (#1295)

package.json

@@ -5,6 +5,9 @@
   "main": "none.js",
   "scripts": {
     "get-proposals": "node ./scripts/proposals.js",
+    "get:submodule": "git submodule update --init --depth 1",
+    "_prepare:docsy": "cd themes/docsy && npm install",
+    "prepare": "npm run get:submodule && npm run _prepare:docsy",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "repository": {