feat(angular-cli): integrate angular-cli (#989)

docs/templates/index.jade

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-
-extends layout
-
-block title
-  | Admin HTML template based on Angular 2, Bootstrap 4 and Webpack
-
-block content
-  div.hero
-    div.hero-content
-      div.wrap
-        div.text
-          strong ng2-#[span.white-text admin]
-        div.minitext Angular 2 admin panel front-end framework
-        div.buttons-unit
-          a.button(href=installationArticleUrl) Installation guidelines
-          a.button(href=firstArticleUrl) Documentation
-        div.admin-screenshots
-          div.admin-screenshot
-            div.browser-mockup
-              a.demo-link(href='http://akveo.com/ng2-admin/',target='_blank')
-                img(src=contents.images['sky-preview.png'].url)
-                span.demo-link-label Demo
-  div.index-block
-    div.wrap
-      h1.centered Why ng2-admin?
-      div.why-items
-        div.why-item
-          img(src=contents.images['why-structure.svg'].url)
-          h4 Awesome structure
-          p Component-based structure is the best choice for large Angular 2 applications.
-        div.why-item
-          img(src=contents.images['why-design.svg'].url)
-          h4 Neat design
-          p We have put a lot of effort and carefully selected each color and font for this template!
-        div.why-item
-          img(src=contents.images['why-practices.svg'].url)
-          h4 Ease of customization
-          p Check out #[a(href='/ng2-admin/articles/011-changing-color-scheme') our article], where we describe how you can create a different look in just 2 minutes!
-  div.index-block
-    div.wrap
-      h1.centered Is it free?
-      p Yes, ng2-admin is completely free and MIT licensed. That means you can do with it whatever you want.
-
-  div.index-block
-    div.wrap
-      h1.centered How can I support you guys?
-      p Here's what you can do:
-      ul
-        li Star #[a(href='https://github.com/akveo/ng2-admin',target='_blank') our GitHub repo]
-        li Create pull requests, submit bugs, suggest new features
-        li Follow #[a(href='https://twitter.com/akveo_inc',target='_blank') us on Twitter]
-        li Like #[a(href='https://www.facebook.com/akveo/',target='_blank') our page on Facebook]
-  div.index-block
-    div.wrap
-      h1.centered Can I hire you?
-      p Yes! We are available for hire. Visit #[a(href='http://akveo.com',target='_blank') our homepage]
-        | or simply leave us a note at #[a(href='mailto:contact@akveo.com') contact@akveo.com].
-        | We will be happy to work with you!
-