Updated docs to match ShellUI v0.2.0

What's Changed

• Fix section-switcher active state logic for root docs section by @Copilot in #2
• Feat/docs/v0.2.0 by @Shewart in #1

New Contributors

• @Copilot made their first contribution in #2
• @Shewart made their first contribution in #1

Full Changelog: https://github.com/shellui-dev/shellui-docs-fuma/commits/Shellui_version0.2.0