update btc address

app/create.rb

@@ -129,7 +129,16 @@ post '/create' do
     })
   end
 
-  @site.save
+  begin
+    @site.save
+  rescue Sequel::UniqueConstraintViolation => e
+    if e.message =~ /username.+already exists/
+      flash[:error] = 'Username already exists.'
+      return {result: 'error'}.to_json
+    end
+
+    raise e
+  end
 
   unless education_whitelisted?
     @site.send_email(

views/donate.erb

@@ -34,13 +34,8 @@
         -->
 
         <h3>Bitcoin:</h3>
-        <p><img src="/img/bitcoin.png"></p>
+        <p><b><a href="bitcoin:3HPuhRTz4fMyMRaLFHEQ5E2rrxGic8CXJQ">3HPuhRTz4fMyMRaLFHEQ5E2rrxGic8CXJQ</a></b></p>
-        <p><b><a href="bitcoin:1MPYyfoWK8CkAzhLzLLtZGa9dwEGT5dm2T">1MPYyfoWK8CkAzhLzLLtZGa9dwEGT5dm2T</a></b></p>
-
-	<h3>Filecoin</h3>
-	<p><b>f1tub53j4dglc5bcgn2djaqljfkphiw6dem67ev2a</b></p>
-	<p><a href="https://filecoin.io">(more info about Filecoin)</a></p>
 
         <h4 style="margin-top: 30px; margin-bottom: 30px">Thanks. You are great! <a href="/#new">Now go and make an awesome web site!</a></h4>
   </article>
-</div> <!-- end .content -->
+</div>