Update warning and move to top of page.

views/index.erb

@@ -30,6 +30,14 @@
   <div class="container">
     <noscript>FYI: If you enable JavaScript then you will be able to access additional options in the dropdown menus. The website should still be somewhat usable, but recent versions of Firefox will try to download the RSS feeds.</noscript>
 
+    <div class="alert alert-warning" role="alert">
+      <p><strong>Important:</strong> The public version of RSS Box is currently receiving more requests than it can handle. Unfortunately, because of a lack of caching, most requests are now failing. You may therefore have trouble subscribing to some feeds, in particular Twitter and Instagram. This will be addressed in a future update. But for now, please consider self hosting this app (<a href="https://github.com/stefansundin/rssbox#roll-your-own">instructions here</a>).</p>
+
+      <p>Please do not overload this service. Do not make more requests than you need. If you require RSS feeds that are updated very frequently, then please host the app on your own infrastructure. The hosting for this free offering has very limited resources. If you use the service in a way that degrades the experience for others, then I will start blocking your requests. Please be responsible so that as many people as possible can enjoy this free service.</p>
+
+      If you are already subscribed to a lot of feeds on this public instance, then please move them to your own instance.
+    </div>
+
 <% if ENV["TWITTER_ACCESS_TOKEN"] %>
     <form class="input-group" method="get" action="twitter">
       <div class="input-group-prepend">
@@ -241,13 +249,11 @@
     <h2 id="about">About</h2>
 
     <p>This website lets you subscribe to RSS feeds for websites that do not support RSS themselves, by using the respective website's API and then translating that data to RSS feeds.</p>
-    <p>If you get a page saying "Application error", simply try again. This website resolves shortlink URLs to give the reader a better experience, and embeds linked content directly into the RSS feed. You will get this error if this takes longer than the web server allows.</p>
+    <p>If you get a page saying "Application error", then simply try again. This website resolves shortlink URLs to give the reader a better experience, and embeds linked content directly into the RSS feed. You will get this error if this takes longer than the web server allows.</p>
     <p>Some websites, like YouTube, support RSS feeds but they are quite hard to find, so this website will provide the URL.</p>
     <p>To open <tt>vlc://</tt> links, see <a href="https://github.com/stefansundin/vlc-protocol">vlc-protocol</a>.</p>
     <p><a href="https://github.com/stefansundin/rssbox">This app is free software.</a></p>
 
-    <p><strong>Important:</strong> Please do not overload this service. Do not make more requests than you need. If you require RSS feeds that are updated very frequently, then please host the app on your own infrastructure. The hosting for this free offering has very limited resources. If you use the service in a way that degrades the experience for others, then I will start blocking your requests. Please be responsible so that as many people as possible can enjoy this free service.</p>
-
     <h2 id="donate">Donate</h2>
 
     <p>I provide this service free of charge. If you find it useful, please make a donation. I greatly appreciate any support!</p>