Maintenance: Update docs base origin url

[hjgraca]

Summary

Update base origin variable in mkdocs javascript

Why is this needed?

Due to the move to the new domain docs.powertools.aws.dev we need to update the old entries that point to awslabs.github.io

Which area does this relate to?

No response

Solution

Change awslabs.github.io to docs.powertools.aws.dev

Acknowledgment

• This request meets Powertools for AWS Lambda (TypeScript) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Python, Java, and .NET

Future readers

Please react with 👍 and your use case to help us understand customer demand.

[boring-cyborg]

Thanks for opening your first issue here! We'll come back to you as soon as we can.
In the meantime, check out the #typescript channel on our Powertools for AWS Lambda Discord: Invite link

[dreamorosi]

Thank you @hjgraca for the issue!