docs: use recommended AWS CLI authentication

Do not use access keys, instead link to authentication
documentation.

The recommended aproach is
https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-sso.html

Author: coderbyheart

.envrc.example

@@ -1,8 +1,3 @@
-export AWS_REGION=...                   # AWS region to use, e.g. eu-west-1
-export AWS_DEFAULT_REGION=$AWS_REGION
-export AWS_ACCESS_KEY_ID= ...           # Your AWS Access Key ID
-export AWS_SECRET_ACCESS_KEY=...        # Your AWS Secret Access Key
-
 # Suppress warnings caused by using the latest Node.js version
 export JSII_SILENCE_WARNING_UNTESTED_NODE_VERSION=1
 export NODE_NO_WARNINGS=1

.gitignore

@@ -7,7 +7,6 @@ npm-debug.log
 .swc/
 cdk.out/
 dist/
-.envrc
 /certificates/
 cdk.context.json
 e2e-test-result.json

README.md

@@ -16,10 +16,9 @@ using [AWS CDK](https://aws.amazon.com/cdk) in
 
 ### Setup
 
-Provide your AWS credentials, for example using the `.envrc` (see
-[the example](.envrc.example)).
+[Provide your AWS credentials](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-authentication.html).
 
-### Install the dependencies
+Install the dependencies:
 
 ```bash
 npm ci