.gitignore uses bad practice

[waypar]

Describe the bug

I used this repo as an example and I got caught out by copying the .gitignores from here which includes cdk.context.json.
This isn't best practice according to https://docs.aws.amazon.com/cdk/v2/guide/context.html#context-construct

I saw in #689 that you don't want to remove this, fair enough, but I think it would be a good idea to add a note about it.

Expected Behavior

AWS provided sample code doesn't provide examples of bad practice.

Current Behavior

cdk.context.json is ignored without any context.

Reproduction Steps

NA

Possible Solution

See attached PR

Additional Information/Context

No response

CDK CLI Version

Framework Version

No response

Node.js Version

OS

All

Language

Typescript

Language Version

No response

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