feat: add AI tools, improve configs, and update README

Changelog:
- Added AI tools and services (Ollama, SearXNG, Open WebUI)
- Updated README with AI tools section and improved formatting
- Added new Rust tools (`cargo-feature`, `cargo-features-manager`)
- Improved virtualisation config with `nvidia-docker`
- Added new work tools (`ssm-session-manager-plugin`, `redli`)
- Updated Helix, Qutebrowser, and Oterm configs
- Added Open WebUI and SearXNG config files

nixos/work.nix

@@ -5,9 +5,11 @@
     slack
     aws-sam-cli
     awscli2
+    ssm-session-manager-plugin
     cargo-lambda
     gnumake
     cmake
+    redli
     firebase-tools
   ];
 }