Remove unused Angular annotation-share template

src/sidebar/templates/annotation-share-dialog.html

-<div class="annotation-share-dialog__backdrop"
-     ng-if="vm.isOpen"
-     ng-click="vm.onClose()"></div>
-<div class="annotation-share-dialog" ng-class="{'is-open': vm.isOpen}">
-  <div class="annotation-share-dialog-target">
-    <span class="annotation-share-dialog-target__label u-stretch">Share:</span>
-    <a href="https://twitter.com/intent/tweet?url={{vm.uri | urlEncode}}&hashtags=annotated"
-      target="_blank"
-      title="Tweet link"
-      class="annotation-share-dialog-target__icon h-icon-twitter"
-      ng-click="vm.onShareClick('twitter')"></a>
-    <a href="https://www.facebook.com/sharer/sharer.php?u={{vm.uri | urlEncode}}"
-      target="_blank"
-      title="Share on Facebook"
-      class="annotation-share-dialog-target__icon h-icon-facebook"
-      ng-click="vm.onShareClick('facebook')"></a>
-    <a href="mailto:?subject=Let's%20Annotate&amp;body={{vm.uri}}"
-      target="_blank"
-      title="Share via email"
-      class="annotation-share-dialog-target__icon h-icon-mail"
-      ng-click="vm.onShareClick('email')"></a>
-  </div>
-  <div class="annotation-share-dialog-link" type="text">
-    <input class="annotation-share-dialog-link__text"
-      value="{{vm.uri}}" readonly>
-    <span class="annotation-share-dialog-link__feedback" ng-if="vm.copyToClipboardMessage">
-      {{vm.copyToClipboardMessage}}
-    </span>
-    <button class="btn btn-clean annotation-share-dialog-link__btn"
-      ng-click="vm.copyToClipboard($event)">
-      <i class="h-icon-clipboard btn-icon"></i>
-    </button>
-  </div>
-  <div class="annotation-share-dialog-msg" ng-if="vm.group && vm.group.type === 'private' && !vm.isPrivate">
-    <span class="annotation-share-dialog-msg__audience">
-      Group.
-    </span>
-    Only group members will be able to view this annotation.
-  </div>
-  <div class="annotation-share-dialog-msg" ng-if="vm.isPrivate">
-    <span class="annotation-share-dialog-msg__audience">
-      Only me.
-    </span>
-    No one else will be able to view this annotation.
-  </div>
-</div>