fix: reorganize vitepress docs into /docs

docs/.vitepress/config.ts

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+import { defineConfig } from 'vitepress';
+
+export default defineConfig({
+	title: 'Headplane',
+	description: 'The missing dashboard for Headscale',
+	ignoreDeadLinks: ['/docs/Integrated-Mode', '/docs/Simple-Mode'],
+	cleanUrls: true,
+	head: [['link', { rel: 'icon', href: '/favicon.ico' }]],
+	themeConfig: {
+		logo: '/logo.svg',
+		nav: [{ text: 'Home', link: '/' }],
+		sidebar: [
+			{
+				text: 'Chapters',
+				items: [
+					{ text: 'Getting Started', link: '/README' },
+					{ text: 'Configuration', link: '/Configuration' },
+					{ text: 'Bare-Metal Mode', link: '/Bare-Metal' },
+					{ text: 'Integrated Mode', link: '/Integrated-Mode' },
+					{ text: 'Simple Mode', link: '/Simple-Mode' },
+					{ text: 'Nix', link: '/Nix' },
+					{ text: 'NixOS', link: '/NixOS-options' },
+					{ text: 'Security', link: '/SECURITY' },
+					{ text: 'Contributing', link: '/CONTRIBUTING' },
+					{ text: 'Changelog', link: '/CHANGELOG' },
+				],
+			},
+		],
+
+		socialLinks: [
+			{ icon: 'github', link: 'https://github.com/tale/headplane' },
+			{ icon: 'githubsponsors', link: 'https://github.com/sponsors/tale' },
+			{ icon: 'kofi', link: 'https://ko-fi.com/atale' },
+		],
+
+		lastUpdated: {
+			text: 'Updated at',
+			formatOptions: {
+				dateStyle: 'full',
+				timeStyle: 'medium',
+			},
+		},
+	},
+});

docs/.vitepress/theme/custom.css

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+html.dark .light-only {
+	display: none !important;
+}
+
+html:not(.dark) .dark-only {
+	display: none !important;
+}

docs/.vitepress/theme/index.ts

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+import DefaultTheme from 'vitepress/theme';
+import './custom.css';
+
+export default DefaultTheme;