docs: add typesense setup

docs/content/doc/setup/typesense.md

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+---
+title: "Typesense"
+date: 2023-09-29T12:23:55+02:00
+draft: false
+menu:
+  sidebar:
+    parent: "setup"
+---
+
+# Use Typesense for enhanced search capabilities
+
+Vikunja supports using [Typesense](https://typesense.org/) for a better search experience.
+Typesense allows fast fulltext search including fuzzy matching support. 
+It may return different results than what you'd get with a database-only search, but generally, the results are more relevant to what you're looking for.
+
+This document explains how to set up and use Typesense with Vikunja.
+
+## Setup
+
+1. First, install Typesense on your system. Refer to [their documentation](https://typesense.org/docs/guide/install-typesense.html) for specific instructions.
+2. Once Typesense is available on your system and reachable by Vikunja, add the relevant configuration keys to your Vikunja config. [Check out the docs article about this]({{< ref "config.md#typesense">}}).
+3. Index all tasks currently in Vikunja. To do that, run the `vikunja index` command with the api binary. This may take a while, depending on the size of your instance.
+4. Restart the api. From now on, all task changes will be automatically indexed in Typesense.