Release v0.11.0

This release of Open VSX consists of:

• ovsx CLI
• openvsx-webui frontend library
• openvsx-server Docker image
• openvsx-webui Docker image

Deploying the server application is documented in the Wiki.

What's Changed

• Use AutoCloseable TempFile by @amvanbaren in #725
• Extension repository signing by @amvanbaren in #673

Full Changelog: v0.10.0...v0.11.0