fix(ci): ensure target/doc directory exists before creating redirect

The deploy-docs job was failing because it tried to write to
target/doc/index.html without ensuring the directory exists first.

Added 'mkdir -p target/doc' before creating the redirect file.

Fixes CI error: 'target/doc/index.html: No such file or directory'

Author: 0xrinegade

.github/workflows/publish-ovsm.yml

@@ -196,6 +196,7 @@ jobs:
 
       - name: Create index.html
         run: |
+          mkdir -p target/doc
           echo '<meta http-equiv="refresh" content="0; url=ovsm/index.html">' > target/doc/index.html
         working-directory: crates/ovsm