Add documentation website (#833)

* test frontmatter rendering

* restructure files

* add docs website

* move postcss config

* revert postcss config

* update readme

* update logo

* fix internal links

docs/astro.config.mjs

@@ -0,0 +1,50 @@
+// @ts-check
+import { defineConfig } from 'astro/config';
+import starlight from '@astrojs/starlight';
+
+// https://astro.build/config
+export default defineConfig({
+	integrations: [
+		starlight({
+			title: 'linkding',
+			logo: {
+				src: './src/assets/logo.svg',
+			},
+			social: {
+				github: 'https://github.com/sissbruecker/linkding',
+			},
+			sidebar: [
+				{
+					label: 'Getting Started',
+					items: [
+						{ label: 'Installation', slug: 'installation' },
+						{ label: 'Managed Hosting', slug: 'managed-hosting' },
+						{ label: 'Browser Extension', slug: 'browser-extension' },
+					],
+				},
+				{
+					label: 'Guides',
+					items: [
+						{ label: 'Options', slug: 'options' },
+						{ label: 'Backups', slug: 'backups' },
+						{ label: 'Admin', slug: 'admin' },
+						{ label: 'Keyboard Shortcuts', slug: 'shortcuts' },
+						{ label: 'How To', slug: 'how-to' },
+						{ label: 'Troubleshooting', slug: 'troubleshooting' },
+						{ label: 'REST API', slug: 'api' },
+					],
+				},
+				{
+					label: 'Resources',
+					items: [
+						{ label: 'Community', slug: 'community' },
+						{ label: 'Acknowledgements', slug: 'acknowledgements' },
+					],
+				},
+			],
+			customCss: [
+				'./src/styles/custom.css',
+			],
+		}),
+	],
+});