chore: add assets (#77)

Author: anssari1

assets/custom-styles.css

@@ -0,0 +1,16 @@
+:root {
+    --sidemenu-section-active-color: #1668e3;
+    --active-section-color: #1668e3;
+    --active-tab-border-color: #1668e3;
+    --hover-link-color: #1668e3;
+    --dokka-logo-height: 35px;
+    --dokka-logo-width: 35px;
+}
+
+.library-name--link::before {
+    margin-right: 10px;
+}
+
+.filter-section .platform-tag {
+    display: none;
+}