docs: Update

docs/installation.md

@@ -12,20 +12,35 @@ cargo install --locked --git https://github.com/lennart-k/rustical
 docker run \
   -p 4000:4000 \
   -v YOUR_DATA_DIR:/var/lib/rustical/ \
-  -v YOUR_CONFIG_TOML:/etc/rustical/config.toml \
   -v YOUR_PRINCIPALS_TOML:/etc/rustical/principals.toml \
+  -v YOUR_CONFIG_TOML:/etc/rustical/config.toml \ # (1)!
+  -e RUSTICAL__CONFIG_OPTION="asd" \  # (2)!
   ghcr.io/lennart-k/rustical
 ```
 
+1. Mount config file
+2. Alternatively specify configuration using environment variables
+
 ## Configuration
 
+RustiCal can be configured using either a `config.toml` file or environent variables.
+
+To see all configuration options available you can browse the [Cargo docs](/rustical/_crate/rustical/config/struct.Config.html).
+
 ### TOML
 
+You can generate a default `config.toml` configuration using
+
+```sh title="Generate default config.toml"
+rustical gen-config
+```
+
 ### Environment variables
 
-The options in `config.toml` can also be configured using environment variables. Names translate the following:
+The options in `config.toml` can also be configured using environment variables.
+Names translate the following:
 
-```toml title="config.toml"
+```toml title="Example config.toml"
 [data_store.toml]
 path = "asd"
 ```

mkdocs.yml

@@ -63,4 +63,4 @@ nav:
       - developers/index.md
       - Relevant RFCs: developers/rfcs.md
       - Debugging: developers/debugging.md
-  - Cargo docs: _cargo/rustical/
+  - Cargo docs: /rustical/_crate/rustical/