Adds donation link to the instance

Check yotter-config.json

app/templates/settings.html

@@ -101,8 +101,13 @@
             <div class="ui segment">
                 <p><b>Server location:</b> {{config.serverLocation}}</p>
             </div>
+            {% if config.donate_url %}
             <div class="ui segment">
-                <p><a href="https://github.com/pluja/Yotter#donate">Consider making a donation</a></p>
+                <p><a href="{{config.donate_url}}">Consider making a donation to the instance</a></p>
+            </div>
+            {% endif %}
+            <div class="ui segment">
+                <p><a href="https://github.com/pluja/Yotter#donate">Donate to the Yotter developer</a></p>
             </div>
     </div>
 </div>

yotter-config.json

@@ -1,7 +1,7 @@
 {
 	"serverName": "yotter.xyz",
 	"nitterInstance": "https://nitter.net/",
-	"maxInstanceUsers": 60,
+	"maxInstanceUsers": 100,
 	"serverLocation": "Germany",
 	"restrictPublicUsage":true,
 	"nginxVideoStream":true,
@@ -10,5 +10,6 @@
 	"admin_message_title":"Message from the admin",
 	"admin_message":"Message from the admin text",
 	"admin_user":"admin_username",
-	"max_old_user_days": 60
+	"max_old_user_days": 60,
+	"donate_url": ""
 }