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/sass/custom.scss

@@ -0,0 +1,6 @@
+.content {
+  max-width: 1000px;
+  margin: 0 auto;
+  padding: 0 0.618em;
+  word-wrap: break-word;
+}