Enhances navigation and updates content metrics

- Reduces the reported number of skills from 63 to 62 and commands from 39/38 to 37, reflecting recent toolkit updates.
- Bumps the displayed version to `v1.1.0`.
- Implements a new responsive navigation menu with a hamburger toggle for mobile views, improving usability on smaller screens.
- Adds a dedicated section to showcase new CLI commands (`upgrade`, `doctor`, `uninstall`), providing clearer visibility into toolkit functionality.

Author: defuj