move general to overview namespace, transfer roadmap to github

docs/src/docPages/overview/installation.md

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+# Installation
+
+tiptap has a very modular package structure and is independent of any framework. Depending on what you want to do with tiptap there are a few different ways to install tiptap in your project. Choose the way that fits your project best.
+
+## Plain JavaScript
+
+Use tiptap with vanilla JavaScript for a very lightweight and raw experience. If you feel like it, you can even use it to connect the tiptap core with other frameworks not mentioned here.
+
+```bash
+# With npm
+npm install @tiptap/core @tiptap/starter-kit
+
+# Or: With Yarn
+yarn add @tiptap/core @tiptap/starter-kit
+```
+
+Great, that should be enough to start. Here is the most essential code you need to get a running instance of tiptap:
+
+```js
+import { Editor } from '@tiptap/core'
+import defaultExtensions from '@tiptap/starter-kit'
+
+new Editor({
+  element: document.getElementsByClassName('element'),
+  extensions: defaultExtensions(),
+  content: '<p>Your content.</p>',
+})
+```
+
+## Vue.js
+
+To use tiptap with Vue.js (and tools that are based on Vue.js) install the Vue.js adapter in your project:
+
+```bash
+# With npm
+npm install @tiptap/vue @tiptap/vue-starter-kit
+
+# Or: With Yarn
+yarn add @tiptap/vue @tiptap/vue-starter-kit
+```
+
+We even prepared a Vue.js starter kit for you. That should give you a good headstart. Create a new component and add the following content to get a basic version of tiptap:
+
+<demo name="General/Installation" />
+
+## CodeSandbox
+
+CodeSandbox is an online coding environment. It’s great to fiddle around without setting up a local project and it’s great to share your code with others.
+
+It’s also amazing for bug reports. Try to recreate a bug there and share it with us before you [file an issue on GitHub](https://github.com/ueberdosis/tiptap-next/issues/new). This helps a ton to fix bugs faster.
+
+* [Vue.js/tiptap on CodeSandbox](https://codesandbox.io/s/vue-issue-template-h0g28)
+
+## CDN
+
+> ⚠️ This is broken and doesn’t work. Don’t use it. We are working on it.
+
+```html
+<script src="https://cdn.jsdelivr.net/npm/tiptap@1.29.4/dist/tiptap.min.js"></script>
+```

docs/src/docPages/overview/roadmap.md

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+# Roadmap
+
+See https://github.com/ueberdosis/tiptap-next/projects/1

docs/src/docPages/overview/upgrade-guide.md

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+# Upgrade Guide
+
+- reasons to upgrade to tiptap 2
+- link to roadmap
+
+## Upgrading from 1.x to 2.x