goreleaser: don't include docs.zip in release

The docs.zip file should not be part of the release as it is no longer
generated nor required to build the docs for a plugin.

Keeping this in the releaser config caused the release to fail before
the artifacts were updated, leading to a corrupted release.

.goreleaser.yml

@@ -95,10 +95,6 @@ signs:
     args: ["sign", "--dearmor", "--file", "${artifact}", "--out", "${signature}"]
     artifacts: checksum
     signature: ${artifact}.sig
-release:
-  # If you want to manually examine the release before its live, uncomment this line:
-  # draft: true
-  - glob: ./docs.zip
 
 changelog:
   use: github-native