refactor(icons): replace FontAwesome with Tabler Icons

Drop the three @fortawesome/* packages (v5, with a stagnant Vue 2
binding) in favor of @tabler/icons-webfont. The old <awe-icon>
wrapper is replaced by <vaquant-icon>, named after the project so
future icon-library swaps don't require another rename.

src/views/accounts/AccountItem.vue

@@ -48,7 +48,7 @@
               href="#"
               @click.prevent="toggleTab('transaction')"
             >
-              <awe-icon icon="dollar-sign" />
+              <vaquant-icon icon="currency-dollar" />
             </a>
           </li>
           <li v-if="transactions.length && locations.length">
@@ -57,7 +57,7 @@
               href="#"
               @click.prevent="toggleTab('location')"
             >
-              <awe-icon icon="globe-europe" />
+              <vaquant-icon icon="world" />
             </a>
           </li>
           <li v-if="transactions.length && tagCount > 1">
@@ -66,7 +66,7 @@
               href="#"
               @click.prevent="toggleTab('tag')"
             >
-              <awe-icon icon="tag" />
+              <vaquant-icon icon="tag" />
             </a>
           </li>
           <li v-if="transactions.length && isMultiUser">
@@ -75,7 +75,7 @@
               href="#"
               @click.prevent="toggleTab('balance')"
             >
-              <awe-icon icon="balance-scale" />
+              <vaquant-icon icon="scale" />
             </a>
           </li>
           <li v-if="isAdmin">
@@ -84,7 +84,7 @@
               href="#"
               @click.prevent="toggleTab('settings')"
             >
-              <awe-icon icon="cog" />
+              <vaquant-icon icon="settings" />
             </a>
           </li>
         </ul>
@@ -155,7 +155,7 @@
       :button-style="backgroundColor"
       :margin="true"
     >
-      <awe-icon icon="money-bill-wave" />
+      <vaquant-icon icon="cash" />
       <span slot="fulltext">dépense</span>
     </fab-button>
   </section>