Add Vitepress docs (#326)

* Add vitepress for docs

* some fix

* Use vitepress and update docs

* Use vitepress and update docs

* Update README.md

* Add favicon

* Add docs by @jiriks74

Co-authored-by: jiriks74 <jiri@stefka.eu>

---------

Co-authored-by: jiriks74 <jiri@stefka.eu>

docs/installation/binary.md

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+# Install from binary
+
+Download the archive for your system from the release page [here](https://github.com/thomiceli/opengist/releases/latest), and extract it.
+
+```shell
+# example for linux amd64
+wget https://github.com/thomiceli/opengist/releases/download/v1.7.4/opengist1.7.4-linux-amd64.tar.gz
+
+tar xzvf opengist1.7.4-linux-amd64.tar.gz
+cd opengist
+chmod +x opengist
+./opengist # with or without `--config config.yml`
+```
+

docs/installation/docker.md

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+# Install with Docker
+
+Docker [images](https://github.com/thomiceli/opengist/pkgs/container/opengist) are available for each release :
+
+```shell
+docker pull ghcr.io/thomiceli/opengist:1
+```
+
+It can be used in a `docker-compose.yml` file :
+
+1. Create a `docker-compose.yml` file with the following content
+2. Run `docker compose up -d`
+3. Opengist is now running on port 6157, you can browse http://localhost:6157
+
+```yml
+version: "3"
+
+services:
+  opengist:
+    image: ghcr.io/thomiceli/opengist:1
+    container_name: opengist
+    restart: unless-stopped
+    ports:
+      - "6157:6157" # HTTP port
+      - "2222:2222" # SSH port, can be removed if you don't use SSH
+    volumes:
+      - "$HOME/.opengist:/opengist"
+    environment:
+      # OG_LOG_LEVEL: info
+      # other configuration options
+```
+
+You can define which user/group should run the container and own the files by setting the `UID` and `GID` environment
+variables :
+
+```yml
+services:
+  opengist:
+    # ...
+    environment:
+      UID: 1001
+      GID: 1001
+```

docs/installation/source.md

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+# Installation from source
+
+Requirements:
+* [Git](https://git-scm.com/downloads) (2.28+)
+* [Go](https://go.dev/doc/install) (1.22+)
+* [Node.js](https://nodejs.org/en/download/) (16+)
+* [Make](https://linux.die.net/man/1/make) (optional, but easier)
+
+```shell
+git clone https://github.com/thomiceli/opengist
+cd opengist
+
+git checkout v1.7.4 # optional, to checkout the latest release
+
+make
+./opengist
+```
+
+Opengist is now running on port 6157, you can browse http://localhost:6157