Revert "Added webp images"

This reverts commit 03d14019fe02024bf2fee59d38603294614a4102.

web/layouts/partials/header.html

@@ -41,7 +41,7 @@
     </div>
     <div class="jumbotron jumbotron-fluid">
         <div class="container">
-            {{ $img := "img/lazpaint_icon.webp" | relURL -}}
+            {{ $img := "img/lazpaint_icon.png" | relURL -}}
             <img class="logo" src="{{ $img }}" width="128" height="128" style="float: left" alt="LazPaint logo">
             <h1 class="display-4">LazPaint</h1>
             <p class="lead" style="color: #e0e0e0;">{{ i18n "app_description" }}</p>

web/static/css/style.css

@@ -12,7 +12,7 @@ body {
 }
 
 .jumbotron {
-    background-image: url('../img/blog-back.webp');
+    background-image: url('../img/blog-back.jpg');
     background-size: cover;
     background-repeat: no-repeat;
     margin: 0px;
@@ -38,7 +38,7 @@ body {
 
 .download {
     min-height: 100vh;
-    background-image: url('../img/lzpwall.webp');
+    background-image: url('../img/lzpwall.jpg');
     background-size: cover;
     background-position: center;
     color: white;