fix(docs): docs fixes, minimize icons, remove unused fonts

docs/app/@theme/components/footer/footer.component.html

@@ -16,17 +16,17 @@
     <li><strong class="title">Follow Us</strong></li>
     <li class="social">
       <a href="https://github.com/akveo/ngx-admin" target="_blank">
-        <i class="small-social-github"></i>
+        <nb-icon icon="github"></nb-icon>
       </a>
       <a href="https://twitter.com/akveo_inc" target="_blank">
-        <i class="small-social-twitter"></i>
+        <nb-icon icon="twitter"></nb-icon>
       </a>
       <a href="https://www.facebook.com/akveo" target="_blank">
-        <i class="small-social-facebook"></i>
+        <nb-icon icon="facebook"></nb-icon>
       </a>
     </li>
     <li class="copy">
-      &copy; 2015-2018 <a href="http://akveo.com?utm_source=nebular_documentation&utm_medium=footer" target="_blank">Akveo LLC</a><br>
+      &copy; 2015-2019 <a href="http://akveo.com?utm_source=nebular_documentation&utm_medium=footer" target="_blank">Akveo LLC</a><br>
       Documentation licensed under CC BY 4.0.
     </li>
   </ul>

docs/app/@theme/components/footer/footer.component.scss

@@ -55,10 +55,12 @@
       display: flex;
       flex-direction: row;
       a {
-        font-size: 3rem;
-        text-decoration: none;
         color: $icon-color;
         margin-right: 1rem;
+
+        nb-icon {
+          font-size: 3rem;
+        }
       }
     }
   }

docs/app/@theme/styles/styles.scss

@@ -1,6 +1,5 @@
 @import 'themes';
 @import 'common';
-@import 'small-social';
 
 @import '../../../../src/framework/theme/styles/global/normalize';
 @import '../../../../src/framework/theme/styles/global/components';
@@ -16,7 +15,7 @@
   @include nb-search-theme();
   @include nb-bootstrap-global();
   @include nb-icon-theme();
-
+  @include nb-input-theme();
   @include nb-typography();
 
   @include nbd-common();

docs/app/documentation/documentation.component.scss

@@ -72,6 +72,10 @@
 
     .menu-item {
       border: none!important;
+
+      .menu-title {
+        flex: 1 1 auto;
+      }
     }
 
     .menu-items .menu-item .menu-item a {