removed posdao theme and logo, added 'page not found' image for goerli

apps/block_scout_web/assets/css/theme/_posdao_variables.scss

@@ -1,29 +0,0 @@
-$primary: #15bba6;
-$secondary: #17314f;
-$tertiary: #00ff00;
-
-$header-links-color-active: #333;
-$dashboard-banner-gradient-start: $secondary;
-$dashboard-banner-gradient-end: #1e4168;
-
-$dashboard-line-color-market: $primary;
-
-$tile-type-block-border-color: $secondary;
-$tile-type-block-color: #333;
-
-$footer-background-color: #173250;
-$footer-text-color: #909dac;
-
-$navbar-logo-height: auto;
-$navbar-logo-width: 100px;
-
-$footer-logo-height: auto;
-$footer-logo-width: 100px;
-
-$card-background-1: $secondary;
-$card-background-1-text-color: #fff;
-
-$btn-copy-color: $secondary;
-$btn-qr-color: $secondary;
-
-$btn-dropdown-line-color: $secondary;

apps/block_scout_web/assets/static/images/posdao_logo_footer.svg

@@ -1,21 +0,0 @@
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-            <stop offset="0%" stop-color="#FFF" stop-opacity="0"/>
-            <stop offset="100%" stop-color="#FFF"/>
-        </linearGradient>
-        <linearGradient id="b" x1="0%" x2="86.603%" y1="50%" y2="0%">
-            <stop offset="0%" stop-color="#FFF"/>
-            <stop offset="100%" stop-color="#FFF" stop-opacity="0"/>
-        </linearGradient>
-    </defs>
-    <path fill="#FFF" fill-rule="evenodd" d="M16.001 36L.005 26.999V8.998L16.001-.003l15.996 9.001v18.001L16.001 36zm10.074-23.52L15.994 6.83 5.912 12.48v11.301l10.082 5.65 10.081-5.65V12.48z" opacity=".4"/>
-    <path fill="none" d="M0 8.934l5.914 3.688v10.499L0 19.433V8.934z" opacity=".6"/>
-    <path fill="url(#a)" d="M0 8.934l5.914 3.688v10.499L0 19.433V8.934z"/>
-    <path fill="none" d="M31.992 8.934l-5.915 3.688v10.499l5.915-3.688V8.934z" opacity=".6"/>
-    <path fill="url(#a)" d="M31.992 8.934l-5.915 3.688v10.499l5.915-3.688V8.934z"/>
-    <path fill="none" d="M15.861 29.431l10.216-5.541v6.569L15.861 36v-6.569z" opacity=".6"/>
-    <path fill="url(#b)" d="M15.861 29.431l10.216-5.541v6.569L15.861 36v-6.569z"/>
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