loading: Remove first_run_message.

I don't believe it's actually been possible for this to be shown in
Zulip in several years; and we just made it more obviously so
(resulting in a linter error).

static/js/message_util.js

@@ -10,7 +10,6 @@ function add_messages(messages, msg_list, opts) {
     }
 
     loading.destroy_indicator($('#page_loading_indicator'));
-    $('#first_run_message').remove();
 
     const render_info = msg_list.add_messages(messages, opts);
 

static/js/setup.js

@@ -13,8 +13,6 @@ $(function () {
     // get_events completes.
     if (!page_params.needs_tutorial) {
         loading.make_indicator($('#page_loading_indicator'), {text: 'Loading...', abs_positioned: true});
-    } else if (!page_params.needs_tutorial) {
-        $('#first_run_message').show();
     }
 
     // This is an issue fix where in jQuery v3 the result of outerHeight on a node

templates/zerver/app/home.html

@@ -31,24 +31,6 @@
     </div>
     <div id="loading_older_messages_indicator"></div>
     <div id="page_loading_indicator"></div>
-    <div id="first_run_message" class="empty_feed_notice">
-        <h4>{% trans %}Welcome to Zulip.{% endtrans %}</h4>
-        <p>
-            {% trans %}
-            See, the thing about it is... there aren't any messages
-            here for you right now. I'm sure someone will eventually send
-            you one.
-            {% endtrans %}
-        </p>
-
-        <p>
-            {% trans %}
-            Or, <strong>take matters into your own hands</strong>,
-            and <a href="#" class="empty_feed_compose_stream">
-            compose a new stream message</a>.
-            {% endtrans %}
-        </p>
-    </div>
     <div id="empty_narrow_message" class="empty_feed_notice">
         <h4>{{ _("Nothing's been sent here yet!") }}</h4>