docs: Drop docs older than 0.21

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-# Arch Linux
-
-## Installation
-
-> [Hoarder on AUR](https://aur.archlinux.org/packages/hoarder) is not maintained by the hoarder official.
-
-1. Install hoarder
-
-    ```shell
-    paru -S hoarder
-    ```
-
-2. (**Optional**) Install optional dependencies
-
-    ```shell
-    # meilisearch: for full text search
-    paru -S meilisearch
-
-    # ollama: for automatic tagging
-    paru -S ollama
-
-    # hoarder-cli: hoarder cli tool
-    paru -S hoarder-cli
-    ```
-
-    You can use Open-AI instead of `ollama`. If you use `ollama`, you need to download the ollama model. Please refer to: [https://ollama.com/library](https://ollama.com/library).
-
-3. Set up
-
-    Environment variables can be set in `/etc/hoarder/hoarder.env` according to [configuration page](/configuration). **The environment variables that are not specified in `/etc/hoarder/hoarder.env` need to be added by yourself.**
-
-4. Enable service
-
-    ```shell
-    sudo systemctl enable --now hoarder.target
-    ```
-
-    Then visit `http://localhost:3000` and you should be greated with the Sign In page.
-
-## Services and Ports
-
-`hoarder.target` include 3 services: `hoarder-web.service`, `hoarder-works.service`, `hoarder-browser.service`. 
-
-- `hoarder-web.service`: Provide hoarder WebUI service, use `3000` port default.
-
-- `hoarder-works.service`: Provide hoarder works service, no port.
-
-- `hoarder-browser.service`: Provide browser headless service, use `9222` port default.