Delete docs/config_file.md

docs/config_file.md

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-## Config file
-
-- [Example](#example)
-- [Location](#location)
-- [Creating the file](#creating-the-file)
-
-### Example
-
-An example config can be found by running:
-
-```sh
-navi info config-example
-```
-
-You can also read it online by clicking [here](./config_file_example.yaml).
-
-### Location
-
-Run the following command to check where the config file is/should be located:
-
-```sh
-navi info config-path
-```
-
-### Creating the file
-
-Run the following command to generate a config file with the default parameters:
-
-```sh
-navi info config-example > "$(navi info config-path)"
-```
-
-### Logging
-
-The log file will be created under the same directory where the config locates.
-
-And you can use the `RUST_LOG` env to set the log level, e.g. `RUST_LOG=debug navi`.