Add Liberapay Donate button

css/styles.css

@@ -399,6 +399,10 @@ figcaption {
 
 #flattr {font-size:0.6em;}
 
+#flattr a {
+    margin-right: 1em;
+}
+
 #footer_container {
     background-color:#87C214;
     color:#fff;

img/liberapay.svg

+<svg xmlns="http://www.w3.org/2000/svg" width="83" height="30"><rect id="back" fill="#f6c915" x="1" y=".5" width="82" height="29" rx="4"/><svg viewBox="0 0 80 80" height="16" width="16" x="7" y="7"><g transform="translate(-78.37-208.06)" fill="#1a171b"><path d="m104.28 271.1c-3.571 0-6.373-.466-8.41-1.396-2.037-.93-3.495-2.199-4.375-3.809-.88-1.609-1.308-3.457-1.282-5.544.025-2.086.313-4.311.868-6.675l9.579-40.05 11.69-1.81-10.484 43.44c-.202.905-.314 1.735-.339 2.489-.026.754.113 1.421.415 1.999.302.579.817 1.044 1.546 1.395.729.353 1.747.579 3.055.679l-2.263 9.278"/><path d="m146.52 246.14c0 3.671-.604 7.03-1.811 10.07-1.207 3.043-2.879 5.669-5.01 7.881-2.138 2.213-4.702 3.935-7.693 5.167-2.992 1.231-6.248 1.848-9.767 1.848-1.71 0-3.42-.151-5.129-.453l-3.394 13.651h-11.162l12.52-52.19c2.01-.603 4.311-1.143 6.901-1.622 2.589-.477 5.393-.716 8.41-.716 2.815 0 5.242.428 7.278 1.282 2.037.855 3.708 2.024 5.02 3.507 1.307 1.484 2.274 3.219 2.904 5.205.627 1.987.942 4.11.942 6.373m-27.378 15.461c.854.202 1.91.302 3.167.302 1.961 0 3.746-.364 5.355-1.094 1.609-.728 2.979-1.747 4.111-3.055 1.131-1.307 2.01-2.877 2.64-4.714.628-1.835.943-3.858.943-6.071 0-2.161-.479-3.998-1.433-5.506-.956-1.508-2.615-2.263-4.978-2.263-1.61 0-3.118.151-4.525.453l-5.28 21.948"/></g></svg><text fill="#1a171b" text-anchor="middle" font-family="Helvetica Neue,Helvetica,Arial,sans-serif"
+          font-weight="700" font-size="14" x="50" y="20">Donate</text></svg>
\ No newline at end of file

index.html

@@ -79,6 +79,7 @@
 
         <div id="flattr">
           <center>
+            <a href="https://liberapay.com/Briar/donate" rel="noopener noreferrer"><img alt="Donate using Liberapay" src="img/liberapay.svg"></a>
             <a href="https://flattr.com/t/592836/" rel="noopener noreferrer" target="_blank"><img src="img/flattr-badge-large.png" alt="Flattr this" title="Flattr this" border="0"/></a>
             <br />
             Bitcoin: 1NZCKkUCtJV2U2Y9hDb9uq8S7ksFCFGR6K