feat: improve readme

Author: QEDK

README.md

@@ -11,31 +11,44 @@ You can pass additional flags to the script like:
 ```bash
 curl -sL1 avail.sh | bash -s -- --network goldberg
 ```
+
 Currently available flags are:
 * `network`: can be one of the following: [`goldberg`, `local`]
 * `config`: path to the configuration file, availup will generate a config if this flag is not specified
+  * This flag is always required when running a local testnet
 * `identity`: path to the identity file, availup will generate a config if this flag is not specified
+  * It is important to keep your identity file safe!
 * `app_id`: application ID to run the light client (defaults to `0`)
+  * It is recommended to not change this flag unless you require the app-specific mode.
 * `upgrade`: takes `y` and `yes` as valid arguments, indicating that the `avail-light` binary should be upgraded
+  * Using this flag wipes your existing data and config, use with caution!
 
-You can modify the existing default config by running and rerun `availup` to use the new config:
+You can use a custom config by passing it to `availup` as a flag:
 ```bash
 # create the config:
-touch ~/.avail/config/config.yml
+touch ~/config.yml
 # edit the config:
-nano ~/.avail/config/config.yml
+nano ~/config.yml
 # and rerunning the script:
-curl -sL1 avail.sh | bash -s -- --config ~/.avail/config/config.yml
+curl -sL1 avail.sh | bash -s -- --config ~/config.yml
 ```
 
+> ⚠️ It is not recommended to modify the default config stored in `~/.avail/config/config.yml` as that gets wiped on
+> each run.
+
 Alternatively, you can pass a specific application ID with `availup`:
 ```bash
 rm ~/.avail/goldberg/config.yml
 # and rerunning the script with flags:
 curl -sL1 avail.sh | bash -s -- --app_id 1
 ```
 
-To upgrade the light client to a latest version, you can simply pass the `--upgrade` flag like:
+> ℹ️ Adding an app ID disables the LC mode and runs your client in an app-specific mode, this might not be your
+> intention.
+
+To upgrade the light client to the latest supported version, you can simply pass the `--upgrade` flag like:
 ```bash
 curl -sL1 avail.sh | bash -s -- --upgrade y
 ```
+
+> ℹ️ Upgrading the LC only works if the binary was installed with the latest `availup` script or cargo.