docs: remove VoxHash Technologies and voxhash.dev from hygiene docs

Use LicenseChain support/security contacts only in CODE_OF_CONDUCT, CONTRIBUTING, and SECURITY.

Author: VoxHash

CONTRIBUTING.md

@@ -1,6 +1,6 @@
 # Contributing to LicenseChain JavaScript SDK
 
-Thanks for helping improve this SDK. Maintained by **LicenseChain** ([support@licensechain.app](mailto:support@licensechain.app)).
+Thanks for helping improve this SDK.
 
 ## License
 

SECURITY.md

@@ -11,7 +11,7 @@
 
 Do **not** open a public GitHub issue for security vulnerabilities.
 
-Email **LicenseChain** at [support@licensechain.app](mailto:support@licensechain.app) or [security@licensechain.app](mailto:security@licensechain.app) with:
+Email [security@licensechain.app](mailto:security@licensechain.app) with:
 
 - Description of the issue
 - Steps to reproduce