chore: move zola infrastructure to deprecated/

Relocate legacy static site generator configuration to clear
namespace for new Rust-based compiler:

- config.toml, netlify.toml
- sass/, templates/ directories
- themes/apollo submodule (updated .gitmodules path)

Content directory preserved at root for compatibility.

deprecated/netlify.toml

@@ -0,0 +1,6 @@
+[build]
+publish = "public"
+command = "zola build"
+
+[build.environment]
+ZOLA_VERSION = "0.19.2"