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.

netlify.toml

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