Add logo to isocpp.github.io/CppCoreGuidelines (#1114)

* Adding logo png & text changes

* Minor fixes

* Adding image to sidebar

* fixed image location

* fixed image location

* squash me

* sidebar

* sidebar

* sidebar

* sidebar

* update

* update

* Image size

* image

* image

* image

* Smaller image

* Smaller image

* Smaller image

INSTRUCTIONS.txt

@@ -20,3 +20,5 @@ layout: default
 9. Refresh the http://isocpp.github.io/CppCoreGuidelines/ to verify that the
 build succeeded. If not, check your email! If the page fails to build, you'll 
 get a mail explaining why. 
+
+Note the index on the gh-pages is updated manually.

_includes/sidebar.html

@@ -1,12 +1,15 @@
 <div class="sidebar">
   <div class="container sidebar-sticky">
     <div class="sidebar-about">
+      <img src="cpp_core_guidelines_16b.png"/>
+      <!--
       <h3>
-        <!--<a href="{{ site.baseurl }}">-->
+        <!- -<a href="{{ site.baseurl }}">- ->
         <a href="https://github.com/isocpp/CppCoreGuidelines">  
           C++ Core Guidelines
         </a>
       </h3>
+      -->
     </div>
     <nav class="sidebar-nav">
       <small>
@@ -14,7 +17,7 @@
 
         <div class="switch">
           <input class="tgl tgl-cpp" id="hl_button" type="checkbox"/>
-          <label class="tgl-btn" data-tg-off="No highlight" data-tg-on="Highlight" for="hl_button"></label>
+          <label class="tgl-btn" data-tg-off="Turn ON syntax highlighting" data-tg-on="Turn OFF syntax highlighting" for="hl_button"></label>
         </div>
       <!-- Items have to be added manually until for now -->
       <b><a class="sidebar-nav-item active" href="#main">Top</a></b>
@@ -51,10 +54,11 @@
       <a class="sidebar-nav-item active" href="#S-unclassified">To-do: Unclassified proto-rules</a>
         {% else %}
 
-      <a class="sidebar-nav-item active" href="CppCoreGuidelines.html">C++ Core Guidelines</a>
-      <a class="sidebar-nav-item active" href="index.html">README</a>
-      <a class="sidebar-nav-item active" href="CONTRIBUTING.md">Contributing</a>
-      <a class="sidebar-nav-item active" href="LICENSE">License</a>
+      <a class="sidebar-nav-item active" href="CppCoreGuidelines.html">Read the C++ Core Guidelines</a>
+      <br/>
+      <a class="sidebar-nav-item active" href="index.html">View project README</a>
+      <a class="sidebar-nav-item active" href="CONTRIBUTING.md">View project Contributing</a>
+      <a class="sidebar-nav-item active" href="LICENSE">View project License</a>
         {% endif %}
 
       </small>

public/css/custom.css

@@ -4,7 +4,7 @@
 
 .inner {
   position: relative;
-  max-width: 640px;
+  max-width: 1280px;
   padding: 20px 10px;
   margin: 0 auto;
 }