Update Docs:CLI related with Account Management (#165)

Co-authored-by: Youngteac Hong <[email protected]>

docs/cli.mdx

@@ -112,13 +112,15 @@ Flags:
 To use admin commands, you need to log in to the server. You can log in to the server using the `login` subcommand:
 
 ```bash
-$ yorkie login -u <username> -p <password> --rpc-addr api.yorkie.dev:443
+$ yorkie login -u <username> --rpc-addr api.yorkie.dev:443
+Enter Password:
 ```
 
-Username and password are the same as the ones you used to log in to the [dashboard](/dashboard).
+The account is the same as the account you use to log in to the [Dashboard](https://yorkie.dev/dashboard).
+If you don't have an account, you can create one by signing up at [Dashboard](https://yorkie.dev/dashboard).
 
 > If you are using the [self-hosted server](/docs/self-hosted-server), default username and password are `admin` and `admin`.
-> You can log in to the server using `yorkie login -u admin -p admin --insecure`.
+> You can log in to the server using `$ yorkie login -u admin -p admin --insecure`. Or: `$ yorkie login -u admin --insecure`. 
 
 Once you log in to the server, the CLI stores the access token in the `~/.yorkie/config.json` file.
 You can check the context of the CLI using the `context` subcommand:
@@ -130,16 +132,40 @@ $ yorkie context ls
  *        localhost:8080      true      eyJhbGciOi...FUT3js73Mw 
 ```
 
-If you want to log out from the server, you can use the `logout` subcommand:
 
+### Logout
+
+If you want to log out from the server, you can use the `logout` subcommand:
 ```bash
 $ yorkie logout
 $ yorkie context ls
  CURRENT  RPC ADDR            INSECURE  TOKEN                   
  *        api.yorkie.dev:443  false     eyJhbGciOi...DuhaUgofYg 
 
+
+```
+### Change Password
+
+If you want to change your password, you can use the command `passwd`.
+
+```bash
+$ yorkie passwd -u <username> --rpc-addr api.yorkie.dev:443
+Enter Password:
+Enter New Password:
 ```
 
+### Delete Account
+
+If you want to delete your account, you can use the command `delete-account`.
+
+```bash
+$ yorkie delete-account -u <username> --rpc-addr api.yorkie.dev:443
+Enter Password:
+WARNING: ...
+```
+
+ This command will delete your account and all data associated with it. Please be careful when using this command.
+
 ### Project
 
 Project represents your service or application in Yorkie. Separate Projects can exist within a single application. You can add more Projects as needed, for example, if you want to manage [auth webhook](/docs/cli#auth-webhook) and documents for specific purposes.