Fix: root README linking and domain badges

[finnholland]

Description of the proposed changes

• fixed links in readme pointing to /packages/<package> not /packages/constructs/<package> now the root readme will redirect
• Also updated the yarn install step

Here's my fork with the links for example: readme-linking

Notes to reviewers

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[finnholland]

Looks like the check for packages is run against /packages which would list cdk-aspects and constructs should that be lowered into packages/constructs?

[TheOrangePuff]

@finnholland I think the readme update workflow has been fixed, you might need to rebase or merge main into this PR. But then should be good to merge 😄

[finnholland]

Well that fork was way out of sync lol... that's looking a bit better now!