chore: update postinstall script (docsifyjs#2791)

Author: sy-records

.husky/install.mjs

@@ -0,0 +1,6 @@
+// Skip Husky install in production and CI
+if (process.env.NODE_ENV === 'production' || process.env.CI === 'true') {
+  process.exit(0);
+}
+const husky = (await import('husky')).default;
+console.log(husky());

SECURITY.md

@@ -115,8 +115,8 @@
     "docker:test": "npm run docker:cli -- test",
     "lint:fix": "prettier . --write && eslint . --fix",
     "lint": "prettier . --check && eslint .",
-    "postinstall": "opencollective-postinstall && npx husky install",
-    "prepare": "npm run build",
+    "postinstall": "opencollective-postinstall",
+    "prepare": "npm run build && node .husky/install.mjs",
     "prettier": "prettier . --write",
     "pub:next": "cross-env RELEASE_TAG=next sh build/release.sh",
     "pub": "sh build/release.sh",