clean up some headings

lib/public/stylesheets/style.css

@@ -101,9 +101,9 @@ h2 {
   margin-top: 2em;
 }
 
-
-h4 {
-  margin-top: 1em;
+h3 {
+  font-size: 1.3rem;
+  margin-top: 2em;
 }
 
 .code {

lib/views/index.html.ejs

@@ -142,7 +142,7 @@
       <hr>
 
       <section id="meta">
-        <h3><a href="#meta">Meta</a></h3>
+        <h2><a href="#meta">Meta</a></h2>
         <p>
           In the examples above, you can generally use usernames instead of <mark class="green">uuid</mark>. However, apart from the special cases <code><a href="/renders/body/0?default=MHF_Steve" target="_blank">MHF_Steve</a></code> and <code><a href="/renders/body/0?default=MHF_Alex" target="_blank">MHF_Alex</a></code> this is discouraged as explained below.<br>
           You can append <code>.png</code> or any other file extension to the URL path if you like to, but all images are PNG.
@@ -152,7 +152,7 @@
           <h3><a href="#meta-attribution">Attribution</a></h3>
           <p>
             Attribution is <strong>encouraged</strong> but not required.<br>
-            If you want to show some support for this (free!) site, place a notice like this somewhere:
+            If you want to show some support for this (free!) service, place a notice like this somewhere:
             <div class="code">
               Thank you to &lt;a href="https://crafatar.com"&gt;Crafatar&lt;/a&gt; for providing avatars.
             </div>