Webpage module => WIP

...admin/instance/containers/configure-instance.component.ts

client/src/app/admin/instance/webpages/components/index.ts

...stance/webpages/components/webpage-content.component.html

...instance/webpages/components/webpage-content.component.ts

...ance/webpages/components/webpage-list-menu.component.html

...stance/webpages/components/webpage-list-menu.component.ts

...instance/webpages/containers/webpages-list.component.html

...instance/webpages/containers/webpages-list.component.scss

...n/instance/webpages/containers/webpages-list.component.ts

client/src/app/metamodel/actions/webpage.actions.ts

client/src/app/metamodel/effects/index.ts

client/src/app/metamodel/effects/webpage.effects.ts

client/src/app/metamodel/metamodel.reducer.ts

client/src/app/metamodel/models/index.ts

client/src/app/metamodel/models/webpage.model.ts

client/src/app/metamodel/reducers/webpage.reducer.ts

client/src/app/metamodel/selectors/webpage.selector.ts

client/src/app/metamodel/services/index.ts

client/src/app/metamodel/services/webpage.service.ts

client/src/styles.scss