Docs structural changes

With multiple frameworks and now Capacitor and Cordova both being first class solutions, there are some ways we can improve the current docs to be more user friendly.

- [ ] Allow setting docs-tabs component state from query param, instead of localStorage

Guide:
The content in the Angular and React sections is similar, let's consolidate so they share the same URL and use something like the docs-tabs component.

- [ ] Hook up framework switcher to Guide content
- [ ] Combine content from React and Angular sections
- [ ] New docs-tabs-like component with no visible tabs, to render framework specific content

Start by inspecting the existing docs-tabs component and the Angular and React Guide sections mentioned in the issue. Trace how framework selection currently reaches Guide content, then consider the query-parameter state and the requested shared, framework-specific content; done means all four checklist items are addressed.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.