fix: resolve critical lodash vulnerabilities in gitbook-plugin-sharing

- Added npm overrides to force lodash ^4.17.21
- Addresses GHSA-fvqr-27wr-82fm, GHSA-35jh-r3h4-6jhm, and others
- Resolves transitive dependency issues in unmaintained gitbook plugin

Author: mhughes2012

package.json

@@ -36,5 +36,8 @@
     "commitizen": {
       "path": "./node_modules/cz-conventional-changelog"
     }
+  },
+  "overrides": {
+    "lodash": "^4.17.21"
   }
 }