Migrate docs to Vuepress

docs/content/.vuepress/config.js

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+module.exports = {
+  title: 'PluralKit',
+
+  base: "/",
+  head: [
+    ["link", { rel: "icon", type: "image/png", href: "/favicon.png" }],
+    ['meta', { name: 'theme-color', content: '#da9317' }],
+    ['meta', { name: 'apple-mobile-web-app-capable', content: 'yes' }],
+    ['meta', { name: 'apple-mobile-web-app-status-bar-style', content: 'black' }]
+  ],
+  evergreen: true,
+
+  markdown: {
+    extendMarkdown: md => {
+      md.use(require("markdown-it-custom-header-link"));
+      md.use(require("markdown-it-imsize"));
+    }
+  },
+
+  themeConfig: {
+    repo: 'xSke/PluralKit',
+    docsDir: 'docs',
+    docsBranch: 'main',
+    editLinks: true,
+    editLinkText: 'Help us improve this page!',
+    lastUpdated: "Last updated",
+    nextLinks: false,
+    prevLinks: false,
+    nav: [
+      { text: "Support server", link: "https://discord.gg/PczBt78" },
+      { text: "Invite bot", link: "https://discord.com/oauth2/authorize?client_id=466378653216014359&scope=bot&permissions=536995904" }
+    ],
+    sidebar: [
+      "/",
+      {
+        title: "Documentation",
+        collapsable: false,
+        sidebarDepth: 2,
+        children: [
+          "/getting-started",
+          "/user-guide",
+          "/command-list",
+          "/api-documentation",
+          "/privacy-policy",
+          "/faq",
+          "/tips-and-tricks"
+        ]
+      },
+      ["https://discord.gg/PczBt78", "Join the support server"],
+      ["https://discord.com/oauth2/authorize?client_id=466378653216014359&scope=bot&permissions=536995904", "Add to your server"],
+    ]
+  },
+
+  plugins: [
+    '@vuepress/plugin-back-to-top',
+    '@vuepress/plugin-medium-zoom',
+    [
+      '@vuepress/google-analytics',
+      {
+        "ga": "UA-173942267-1"
+      }
+    ],
+    ["vuepress-plugin-clean-urls", { normalSuffix: "/" }],
+  ],
+}

docs/content/.vuepress/styles/index.styl

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+// For custom styles
+// See: https://vuepress.vuejs.org/config/#index-styl
+
+// Center images on page (only relevant when resized with markdown-it-imsize)
+img
+  display block
+  margin auto

docs/content/.vuepress/styles/palette.styl

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+// Global variables go here, no styles! Some override default theme parameters.
+// See: https://vuepress.vuejs.org/config/#palette-styl
+
+$accentColor = #da9317
+
+// Make page slightly wider (default is 740px)
+$contentWidth = 900px