update docs

docs/10_Description.md

docs/30_Page/10_Page_layout.md

docs/30_Page/20_Navigation.md

docs/30_Page/30_Grid.md

docs/30_Page/_index.md

docs/40_Components/Alert.md

docs/40_Components/Badge.md

docs/40_Components/Button.md

docs/40_Components/Callout.md

docs/40_Components/Card.md

docs/40_Components/Infobox.md

docs/40_Components/Smallbox.md

docs/40_Components/_index.md

docs/50_Forms/Input.md

docs/50_Forms/Textarea.md

docs/50_Forms/_index.md

docs/images/examples_input.png

docs/images/examples_input_append_prepend.png

docs/images/examples_textarea.png

docs/style.css