Implement a number of small fixes

static/style.css

@@ -27,7 +27,7 @@ input[type="text"] {
 }
 
 body {
-    background-image: url("/static/img/trlbg1.jpg");
+    background-image: url("/trlstats/static/img/trlbg1.jpg");
     background-repeat: no-repeat;
     background-attachment: fixed;
     background-size: cover;

static/suggestion.js

@@ -41,7 +41,7 @@ async function sendMessage() {
     }
 
     try {
-        const res = await fetch("/api/feedback", {
+        const res = await fetch("/trlstats/api/feedback", {
             method: "POST",
             headers: {"Content-Type": "application/json"},
             body: JSON.stringify({