Show colored logo on hovering, and remove unused static assets

docusaurus.config.ts

@@ -66,9 +66,9 @@ const config: Config = {
     navbar: {
       logo: {
         alt: 'The Lingua Franca Logo',
-        src: 'img/lf-forlight-mono.svg',
-        srcDark: "img/lf-fordark-mono.svg",
-        style: {marginLeft: "20px"},
+        src: 'img/lf-forlight.svg',
+        srcDark: "img/lf-fordark.svg",
+        className: "lf-navbar-logo",
       },
       items: [
         {

src/css/custom.css

@@ -61,4 +61,30 @@
 [data-theme='dark'] .header-github-link::before {
   background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='white' d='M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12'/%3E%3C/svg%3E")
     no-repeat;
-}
+}
+
+/* LF Navbar logo colouring style */
+.lf-navbar-logo {
+  margin-left: 20px;
+
+  transition: 200ms;
+  transition-timing-function: ease-out;
+}
+
+/* If light theme, re-colour SVG to all dark  */
+[data-theme='light'] .lf-navbar-logo {
+  /* Since Docusaurus doesn't use inline SVG this is a bit magical but is required.
+    contrast converts the SVG to monocolour
+    brightness converts it to 100% dark */
+  filter: contrast(0) brightness(0);
+}
+
+[data-theme='dark'] .lf-navbar-logo {
+  /* Same filter above, and invert(1) makes it 100% light */
+  filter: contrast(0) brightness(1.8);
+}
+
+.lf-navbar-logo:hover {
+  /* On hover disable filters so there's colour */
+  filter: inherit;
+}