docs: Update branding and navigation across documentation site

docusaurus.config.js

@@ -49,13 +49,14 @@ const config = {
     /** @type {import('@docusaurus/preset-classic').ThemeConfig} */
     ({
       navbar: {
-        title: 'Project Mycelium Docs',
+        title: '',
         logo: {
           alt: 'Project Mycelium Logo',
-          src: 'img/mainlogo.png',
+          src: 'img/logo_light.png',
+          srcDark: 'img/logo_dark.png',
         },
         items: [
-          { type: 'doc', docId: 'overview-index', position: 'left', label: 'Overview' },
+          { type: 'doc', docId: 'home', position: 'left', label: 'Home' },
           { to: '/network', label: 'Network', position: 'left' },
           { to: '/cloud', label: 'Cloud', position: 'left' },
           { to: '/vdc', label: 'VDC', position: 'left' },