Feedback form 06.2018

[NickIliev]

• [x] Fix - Broken links https://docs.nativescript.org/ui/layouts#layout-pass

• [x] Improve - add import declaration @tsonevn

• [ ] Improve - add CLI install instructions / link https://docs.nativescript.org/sidekick/intro/requirements @ggarabedian

• [ ] Improve - update CLI required version https://docs.nativescript.org/sidekick/intro/requirements @ggarabedian

• [x] Improve - add an explanation about the generated link that should be manually entered in Chrome https://docs.nativescript.org/tooling/chrome-devtools @tsonevn

• [x] Improve - include android import comment (tns-platform-declaration comment in the snippet) https://docs.nativescript.org/ui/placeholder @tsonevn

• [x] Improve - add PUT and DELETE examples if possible to use https://docs.nativescript.org/angular/code-samples/http @NickIliev

• [x] Improve - 'ui/build' section (add detailed example e.g. how to add view-model or event listener) https://stackoverflow.com/a/39844818/4936697 @NickIliev resolved via https://github.com/NativeScript/docs/pull/1323