Remove obsolete docs/views directory and update plugin references

- Deleted content/docs/views/ directory (non-existent @object-ui/views package)
- Object* components are in separate plugin packages (plugin-grid, plugin-form, etc.)
- Removed "Views Package" references from plugin-gantt.mdx, plugin-map.mdx, plugin-calendar.mdx
- Eliminates duplicate/conflicting documentation

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

content/docs/plugins/plugin-calendar.mdx

@@ -510,5 +510,4 @@ All functionality remains the same - just update your imports and package depend
 ## Related Documentation
 
 - [Plugin System Overview](/docs/concepts/plugins)
-- [Views Package](/docs/views) - ObjectQL data management
 - [Package README](https://github.com/objectstack-ai/objectui/tree/main/packages/plugin-calendar)

content/docs/plugins/plugin-gantt.mdx

@@ -393,5 +393,4 @@ const ganttSchema: ObjectGridSchema = {
 
 - [Timeline Plugin](/docs/plugins/plugin-timeline) - Simpler timeline visualization
 - [Plugin System Overview](/docs/concepts/plugins)
-- [Views Package](/docs/views) - ObjectQL data management
 - [Package README](https://github.com/objectstack-ai/objectui/tree/main/packages/plugin-gantt)

content/docs/plugins/plugin-map.mdx

@@ -452,5 +452,4 @@ const mapSchema: ObjectGridSchema = {
 ## Related Documentation
 
 - [Plugin System Overview](/docs/concepts/plugins)
-- [Views Package](/docs/views) - ObjectQL data management
 - [Package README](https://github.com/objectstack-ai/objectui/tree/main/packages/plugin-map)