docs: Add vuepress with initial docs (#99)

Co-authored-by: Tiffany Le-Nguyen <tlenguyen@expedia.com>
Co-authored-by: Matan Kushner <hello@matchai.me>

docs/.vuepress/config.js

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+module.exports = {
+  title: 'Starship',
+  description: 'The cross-shell prompt for astronauts ☄🌌️',
+  head: [
+    ['link', { rel: 'icon', href: '/icon.png' }]
+  ],
+  themeConfig: {
+    logo: '/icon.png',
+    sidebar: [
+      '/',
+      ['/guide/', 'Guide'],
+      ['/config/', 'Configuration']
+    ],
+    nav: [
+      { text: 'Configuration', link: '/config/' },
+    ],
+    // the GitHub repo path
+    repo: 'starship/starship',
+    // the label linking to the repo
+    repoLabel: 'GitHub',
+    // if your docs are not at the root of the repo:
+    docsDir: 'docs',
+    // defaults to false, set to true to enable
+    editLinks: true,
+    // custom text for edit link. Defaults to "Edit this page"
+    editLinkText: 'Edit this page on GitHub'
+  }
+}

docs/.vuepress/public/_redirects

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+http://starship-rs.netlify.com/* http://starship.rs/:splat 301!

docs/.vuepress/public/icon.png

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+../../../media/icon.png

docs/.vuepress/public/logo.png

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+../../../media/logo.png

docs/.vuepress/public/logo.svg

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+../../../media/logo.svg

docs/.vuepress/styles/palette.styl

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+$accentColor = #DD0B78
+$textColor = #2c3e50
+$borderColor = #eaecef
+$codeBgColor = #282c34
+
+.home .hero img
+  max-width: 500px
+  min-width: 300px
+  width: 100%
+
+#main-title
+  display: none
+
+.hero
+  margin: 150px 25px