Huge improvements for docs (#58)

docs/content/doc/setup/install.md

@@ -0,0 +1,40 @@
+---
+date: "2019-02-12:00:00+02:00"
+title: "Installing"
+draft: false
+type: "doc"
+menu:
+  sidebar:
+    parent: "setup"
+    weight: 10
+---
+
+# Installing
+
+Vikunja consists of two parts: [Backend](https://code.vikunja.io/api) and [frontend](https://code.vikunja.io/frontend).
+While the backend is required, the frontend is not.
+You don't neccesarily need to have a web-frontend, using Vikunja via the [mobile app](https://code.vikunja.io/app) is totally fine.
+
+However, using the web frontend is highly reccommended.
+
+Vikunja can be installed in various forms. 
+This document provides an overview and instructions for the different methods.
+
+* [Backend]({{< ref "install-backend.md">}})
+  * [Installing from binary]({{< ref "install-backend.md#install-from-binary">}})
+    * [Verify the GPG signature]({{< ref "install-backend.md#verify-the-gpg-signature">}})
+    * [Set it up]({{< ref "install-backend.md#set-it-up">}})
+    * [Systemd service]({{< ref "install-backend.md#systemd-service">}})
+    * [Updating]({{< ref "install-backend.md#updating">}})
+    * [Build from source]({{< ref "install-backend.md#build-from-source">}})
+  * [Docker]({{< ref "install-backend.md#docker">}})
+  * [Debian packages]({{< ref "install-backend.md#debian-packages">}})
+  * [Configuration]({{< ref "config.md">}})
+* [Frontend]({{< ref "install-frontend.md">}})
+  * [Docker]({{< ref "install-frontend.md#docker">}})
+  * [NGINX]({{< ref "install-frontend.md#nginx">}})
+  * [Apache]({{< ref "install-frontend.md#apache">}})
+  * [Updating]({{< ref "install-frontend.md#updating">}})
+* [Reverse proxies]({{< ref "reverse-proxies.md">}})
+* [Full docker example]({{< ref "full-docker-example.md">}})
+* [Backups]({{< ref "backups.md">}})