Remove font-awesome and migrate its icons

static/assets/css/fontello.css

@@ -0,0 +1,69 @@
+@font-face {
+    font-family: 'fontello';
+    src: url('../font/fontello.eot?91505657');
+    src: url('../font/fontello.eot?91505657#iefix') format('embedded-opentype'),
+         url('../font/fontello.woff2?91505657') format('woff2'),
+         url('../font/fontello.woff?91505657') format('woff'),
+         url('../font/fontello.ttf?91505657') format('truetype'),
+         url('../font/fontello.svg?91505657#fontello') format('svg');
+    font-weight: normal;
+    font-style: normal;
+  }
+  /* Chrome hack: SVG is rendered more smooth in Windozze. 100% magic, uncomment if you need it. */
+  /* Note, that will break hinting! In other OS-es font will be not as sharp as it could be */
+  /*
+  @media screen and (-webkit-min-device-pixel-ratio:0) {
+    @font-face {
+      font-family: 'fontello';
+      src: url('../font/fontello.svg?91505657#fontello') format('svg');
+    }
+  }
+  */
+   
+   [class^="icon-"]:before, [class*=" icon-"]:before {
+    font-family: "fontello";
+    font-style: normal;
+    font-weight: normal;
+    speak: never;
+   
+    display: inline-block;
+    text-decoration: inherit;
+    width: 1em;
+    margin-right: .2em;
+    text-align: center;
+    /* opacity: .8; */
+   
+    /* For safety - reset parent styles, that can break glyph codes*/
+    font-variant: normal;
+    text-transform: none;
+   
+    /* fix buttons height, for twitter bootstrap */
+    line-height: 1em;
+   
+    /* Animation center compensation - margins should be symmetric */
+    /* remove if not needed */
+    /* margin-left: .2em; */
+   
+    /* you can be more comfortable with increased icons size */
+    /* font-size: 120%; */
+   
+    /* Font smoothing. That was taken from TWBS */
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+   
+    /* Uncomment for 3D effect */
+    /* text-shadow: 1px 1px 1px rgba(127, 127, 127, 0.3); */
+  }
+   
+  .icon-down-open:before { content: '\e800'; } /* '' */
+  .icon-search:before { content: '\e801'; } /* '' */
+  .icon-minus-circled:before { content: '\e802'; } /* '' */
+  .icon-plus-circled:before { content: '\e803'; } /* '' */
+  .icon-link:before { content: '\e804'; } /* '' */
+  .icon-twitter:before { content: '\f099'; } /* '' */
+  .icon-github-circled:before { content: '\f09b'; } /* '' */
+  .icon-fork:before { content: '\f126'; } /* '' */
+  .icon-angle-circled-left:before { content: '\f137'; } /* '' */
+  .icon-angle-circled-right:before { content: '\f138'; } /* '' */
+  .icon-stackoverflow:before { content: '\f16c'; } /* '' */
+  .icon-linkedin-squared:before { content: '\f30c'; } /* '' */