Update docs: Getting started (#85)

* fixed look of links in blockquote

* updated main README

* updated getting started

* updated more-pages

* make custom sidebar loading clear

* updated custom navbar

* added markdown comments

* updated cover documentation

* updated cover page

* updated sidebar

docs/cover.md

@@ -1,15 +1,14 @@
 # Cover
 
-Activate the cover feature by setting `coverpage`. The detail in [Configuration#coverpage](configuration#coverpage).
+Activate the cover feature by setting `coverpage` to **true**. Details are available in the [coverpage configuration paragraph](configuration#coverpage).
 
 ## Basic usage
 
-Set `coverpage` to **true**, and create a `_coverpage.md`. You can see the effect in current website.
-
-
-*index.html*
+Set `coverpage` to **true**, and create a `_coverpage.md`:
 
 ```html
+<!-- index.html -->
+
 <script>
   window.$docsify = {
     coverpage: true
@@ -18,33 +17,34 @@ Set `coverpage` to **true**, and create a `_coverpage.md`. You can see the effec
 <script src="//unpkg.com/docsify"></script>
 ```
 
-*_coverpage.md*
 
 ```markdown
+<!-- _coverpage.md -->
+
 ![logo](_media/icon.svg)
 
-# docsify
+# docsify <small>3.0</small>
 
 > A magical documentation site generator.
 
-- Simple and lightweight (~12kb gzipped)
+- Simple and lightweight (~14kB gzipped)
+- No statically built html files
 - Multiple themes
-- Not build static html files
 
 
 [GitHub](https://github.com/QingWei-Li/docsify/)
-[Get Started](#quick-start)
+[Get Started](#docsify)
 ```
 
 !> A document site can have only one cover page.
 
 ## Custom background
 
-The background color is generated randomly by default. You can customize the background color or image.
-
-*_coverpage.md*
+The background color is generated randomly by default. You can customize the background color or image:
 
 ```markdown
+<!-- _coverpage.md -->
+
 # docsify
 
 [GitHub](https://github.com/QingWei-Li/docsify/)