(demo): add more demos
(demo): add more demos

- Add demo for tags
- Add code blocks for input and buttons

Hypercubed/ngx-ui,swimlane/ngx-ui,swimlane/ngx-ui,Hypercubed/ngx-ui,swimlane/ngx-ui,Hypercubed/ngx-ui,swimlane/ngx-ui,Hypercubed/ngx-ui