v0.35.1: performance, AGPL licensing and documentation overhaul

- Web Server reads static files inline; proxy middleware chain flattened
- About window with license summary and project links; AGPL-3.0-or-later
- Rewritten documentation: feature list, screenshots, performance guide
- Fix false spikes in per-Vhost request-rate charts

src/security/mod.rs

@@ -105,9 +105,9 @@ impl CompiledSecurity {
             headers.insert(*name, value.clone());
         }
         if !tls {
-            headers.remove("strict-transport-security");
+            headers.remove(::http::header::STRICT_TRANSPORT_SECURITY);
         } else if let Some(value) = &self.hsts {
-            headers.insert("strict-transport-security", value.clone());
+            headers.insert(::http::header::STRICT_TRANSPORT_SECURITY, value.clone());
         }
     }
 }